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This plugin came out of a use-case of a shop owner running a hybrid online and brick-and-mortar store, needing greater 
control of restrictions on selling products online. Imagine a local customer calls in and asks you to set aside a copy of a 
new board game, and you want to make sure that they don’t all sell online. Or, you’re pushing a hot new release and want to deter 
scalping bots and/or wholesale buyers from buying more than a handful of a certain product per transaction.
Enter Restrict Stock for WooCommerce – a very small, simple, and lightweight plugin that gives greater control over how the stock of your 
products are displayed and interacted with in the checkout process. Upon installation, a new group of new fields 
will be added to the Product > Inventory interface for all products called “Quantity to restrict,” “Restriction Notes,” and “Quantity to Hide.” 
Please see below for more information on these fields, and how they influence product stock and customers’ user experience.
<pre><code>- **Quantity to Restrict:** If you wish to only allow a certain number of this product to be purchased per transaction, enter it here
- **Restriction Notes:** If you are restricting amounts of this product per transaction, you can enter a custom error message here for when customers attempt to purchase more
- **Quantity to Hide:** If you are reserving, or hiding, a certain number of product from being displayed in stock counts and being sold, enter that number here
</code></pre>

Restrict Stock for WooCommerce

A basic plugin that can enforce quantity limits for products in WooCommerce Orders.

WPClever

WPC Product Quantity for WooCommerce is a handy plugin for fully controlling the quantity number of products in your online store. It assists shop owners in setting min/max quantity and defining the steps for the selection. Remarkably, users are able to turn on or off the decimal quantities on their site and choose among three selector interfaces: default/select/radio buttons.
<h4>Live demo</h4>
Visit our <a href="https://demo.wpclever.net/woopq/?utm_source=content&utm_medium=woopq&utm_campaign=wporg" title="live demo" rel="nofollow ugc">live demo</a> here to see how this plugin works.
<h4>Features</h4>
<ul>
<li>Set minimum/maximum quantity that can be added to cart/purchased</li>
<li>Set the default value for the quantity input</li>
<li>Define the step of quantity for convenient selection of products</li>
<li>Use or replace the default selector with Select or Radio buttons</li>
<li>Enable or disable decimal quantities in options</li>
<li>Limit the maximum quantity of products to be bought per customer</li>
<li>Set predefined separate values easily (for Select/Radio selector only)</li>
<li>Set a range of values (i.e. a range of numbers) (for Select/Radio selector only)</li>
<li>Set decimal step values (must enable decimal units on settings first)</li>
<li>Compatible with all WordPress themes, WooCommerce & WPC plugins</li>
<li>Allow adding global rules (Premium Version)</li>
<li>Allow individual settings for every single product and variation (Premium Version)</li>
</ul>
Wanna save your precious time working on variations? Try our brand-new free plugin <a href="https://wordpress.org/plugins/wpc-variation-bulk-editor/" rel="ugc">WPC Variation Bulk Editor</a> and <a href="https://wordpress.org/plugins/wpc-variation-duplicator/" rel="ugc">WPC Variation Duplicator</a>.
<h4>Practical Uses</h4>
Consider the following practical cases when you need the great help of WPC Product Quantity plugin:
<ul>
<li>(1) Your store sells multiples of the same products at once.</li>
<li>(2) Sell fractional products that can be bought using decimal quantity.</li>
<li>(3) Sell a combo that combines different kinds of units and quantities.</li>
<li>(4) Display the price per item but sell them in pairs.</li>
<li>(5) Sell products in large amounts or in bulk by using big steps for choosing.</li>
<li>(6) Set a fixed maximum quantity for each shopping checkout (limit the maximum to be bought per customer).</li>
<li>(7) Sell a bunch of items as a bundle with different quantity choices.</li>
<li>(8) Sell a set of items as a composite product with a promotional price.</li>
<li>(9) Sell various items at once as frequently bought together deal with complex quantity options.</li>
</ul>
In general, WPC Product Quantity helps store owners manage any kind of product quantity to be sold, whether it is a very huge number like 1000 pieces or tiny ones (including decimal numbers) 0.1 m, 0.2 l, 0.5 kg. Especially when the gap between different choices is bigger than the normal “1” gap, i.e. when you need to configure options for buying a group of 5 items, you will need to set up the step as 5, so that will increase accordingly as 5, 10, 15, 20, 25 and on.
Total Control over the Product Quantity
This tool really is powerful in the sense that users are empowered to totally control the stock distribution across all kinds of products in the store and how many items your customers can buy. In cases (1), (5): When the quantities that customers choose to buy from your store differ greatly from one another, and because the price you’ve set is already the best price possible (it can’t be lower) as it’s a flat price for both retailers and wholesalers, then you will need a tool to let people choose their desired quantity.
To be specific, like there are some customers who buy 50 or 100 items at one time; meanwhile, there are others who only by 3 or 5 at once. So in this case, you can use the default selector and set an appropriate step to help your customers easily customize the quantity to the desired number. Imagine the time and effort when you need to click on and the number only increases by one, phew!
For case (4): In case your store sells items that must be bought in pairs, such as T-shirts for couples, shoes, sandals, but you’d like to display the price for a single item, so you will need to set the minimum quantity to 2 and the step to 2, too. Sometimes, you might want to promote the sale of a newly arrived product, you can give a 10% discount for each set of three by setting the default minimum quantity to 3 and set the step value to 3. It’s to ensure that buyers know they are buying three products at a time, and they can receive the discount provided that they buy a multiple of three items.
Besides, sellers also have the power of limiting the maximum quantity to be bought per customer by setting a max number. It’s probably because the store owners want to give a fair opportunity for more customers to buy a product at a profitable price, so the max quantity is very necessary as in case (6). For greater results, like when you’re holding a Flash sale every single day from 8:00 to 9:00, you can combine this plugin with WPC Product Timer for WooCommerce to make sure each buyer can only get 1 item at maximum.
Decimal Quantity for Fractional Products
There are special situations like case (2) when your products are not frequently sold in whole numbers like 1, 2, 3, but it requires smaller quantities such as 0.5 liters of wine, 2.5 meters of fabric, 4.5 kilograms of rice, etc. As WooCommerce wouldn’t let us use the decimal or fractional units, this is when WPC Product Quantity steps in to save the day. Notably, with this plugin, even decimal step values are accepted as well. Users can have it like 0.25, 0.5, 0.75, 1.0, etc after enabling the decimal units at the first line in settings. This will also come in handy especially when you are handmade material retailers who sell DIY wallpapers, floor mats, origami papers, jewelry pieces or buds, …
Custom Quantity & Selector Interface for Individual Products
The most outstanding feature of this plugin would be the ability to help users configure a deal with complex item quantities as mentioned in case (3). Assume that your store is running a campaign that involves selling a set of cosmetics deals as below:
<ul>
<li>1 box of the organic sleeping mask, default quantity as 1 and limit 2 boxes per customer.</li>
<li>1 bottle of hair shampoo which comes with 4 options of content: 250 ml (sample), 500 ml, 1 l, 1.5 l</li>
<li>1 bag of makeup pads, default quantity as 1 and no max quantity (as long as the stock allows)</li>
</ul>
Now, this might tear your hair out quite a lot, right? Don’t worry. Let’s break it down. To create this offer, you might need to create a product bundle with 3 bundled items and set individual quantity as well as the selector for each.
The first item should have min=1, max=2; either selector interface is fine as the number of choices is small. When the number of options goes higher than 3, as in the second item, we recommend that you use the default or drop down selector instead of radio buttons to save the space. And for the third item, min=1, max should leave blank to use the product stock count. As the number of this item might get a big number, so you should consider using the default selector and a reasonable step to save the effort. In the Premium version of this tool, users can freely set the quantity settings for each product; hence, when combining with other plugins for creating bundles and combos, it’s the most powerful for sellers to configure even the most complicated deal.
<h4>Need more features?</h4>
Please try other plugins from us:
<ul>
<li><a href="https://wordpress.org/plugins/woo-product-timer/" rel="ugc">WPC Product Timer for WooCommerce</a></li>
<li><a href="https://wordpress.org/plugins/wpc-price-by-quantity/" rel="ugc">WPC Price by Quantity for WooCommerce</a></li>
<li><a href="https://wordpress.org/plugins/wpc-price-by-user-role/" rel="ugc">WPC Price by User Role for WooCommerce</a></li>
<li><a href="https://wordpress.org/plugins/wpc-product-options/" rel="ugc">WPC Product Options for WooCommerce</a></li>
<li><a href="https://wordpress.org/plugins/wpc-ajax-add-to-cart/" rel="ugc">WPC AJAX Add to Cart for WooCommerce</a></li>
</ul>

WPC Product Quantity for WooCommerce

WPC Product Quantity for WooCommerce is a handy plugin for fully controlling the quantity number of products in your online store.

Restrict Stock for WooCommerce vs WPC Product Quantity for WooCommerce