KevinMcCall

With Stock Dependencies for WooCommerce, you can make the products and 
variations in your WooCommerce store dependent on the inventory of your other 
products or variations. Customers will be able to select and purchase the 
product without seeing the products on which it depends in their cart, during 
their checkout, or on their receipt. Inventory management in Woo Commerce is 
greatly simplified since you only have to manage inventory levels for the 
item(s) on which your product or variation is dependent.
Stock Dependencies for WooCommerce works for Simple and Variable product types 
in WooCommerce and you can make a product or variation dependent on a 
combination of other products and variations. Stock Dependencies for WooCommerce 
lets you create dependencies on quantities of one or more of the other products.
Stock Dependencies for WooCommerce is ideal for:
<ul>
<li>Selling products in multiple quantities. For an product you already have in 
your inventory, you can use Stock Dependencies for WooCommerce to sell, for 
example, a package of six items and and package of 12 items. With Stock 
Dependencies for WooCommerce you do not need to maintain inventory levels for 
each quantity of the product as the product inventory is managed for only the 
single quantity item.</li>
<li>Selling bundled products. You can create a bundle of 
multiple items and sell them as a single item. With Stock Dependencies for 
WooCommerce your customers will only see the bundle product in their cart, 
during the checkout process, and on their order receipt.</li>
</ul>
When a product with stock dependencies is displayed in your store, Stock 
Dependencies for WooCommerce will check the inventory of the products on which 
it depends and will only show the product as being available if all the 
dependent stock items are available. When a product with stock dependencies is 
added to a shopping cart and eventually purchased, the customer will only see 
the single product in their cart and order, and will not see the products on 
which it is dependent. When the product is purchased, Stock Dependencies for 
WooCommerce will reduce the inventory of the items on which it is dependent by 
the appropriate amount.
<h3>Configuring</h3>
Stock Dependencies for WooCommerce is easy to configure for any simple or 
variable product in your WooCommerce store. A single checkbox is added to each 
simple product or variation in your WordPress admin that allows you to enable 
stock dependencies for that product or variation. Once checked, two fields are 
added for the SKU and the quantity of the dependency. Additional dependencies 
can be easily added.
<h3>Shopping</h3>
When a customer views a product with dependencies in your WooCommerce store, 
they will see the product as you have configured it, but the available quantity 
and in-stock status will be determined by Stock Dependencies for WooCommerce 
from the available quantities of each of the products and variations on which it 
is dependent.
<h3>Cart, Checkout, and Receipt</h3>
Customers will only see the product they selected, and not the products upon 
which it is dependent, in their shopping cart, during the checkout process, and 
on their receipt.
<h3>Restocking Refunds and Cancelled Orders</h3>
When you issue a refund or cancel an order that has stock dependencies, the 
plugin will restock the dependency products.
<h3>Privacy</h3>
The Stock Dependencies for WooCommerce plugin does not affect the way personal 
information is collected or stored within your WooCommerce store or your 
WordPress installation.
<h3>Open Source</h3>
The Stock Dependencies for WooCommerce plugin is open source software. Feel free 
to contribute or fork this code on 
<a href="https://github.com/kmac420/stock-dependencies-for-woocommerce/" rel="nofollow ugc">GitHub</a>.

Stock Dependencies for WooCommerce

GREAT!

Make your products' availability and stock dependent on the inventory of other products in your WooCommerce store.

Automattic

WooCommerce

Manos (a11n)

SomewhereWarm

Jason Kytros

Looking for a way to restrict product access in WooCommerce? Don’t want to set up a full-fledged <a href="https://woocommerce.com/products/woocommerce-memberships/" rel="nofollow ugc">memberships</a> site?
This tiny plugin allows you to restrict access to any WooCommerce product, depending on the ownership or purchase of other, required products.
Features:
<ul>
<li>Conditional product access based on the ownership and/or purchase of other required products.</li>
<li>Support for “ownership”, “purchase” and “ownership/purchase” dependency types.</li>
</ul>
Developers can checkout and contribute to the source code on the plugin’s <a href="https://github.com/woocommerce/woocommerce-product-dependencies/" rel="nofollow ugc">GitHub Repository</a>.
Important: Requires WooCommerce 2.2+. WooCommerce 3.0+ or higher recommended.
Like this plugin? You’ll love our official WooCommerce Extensions:
<ul>
<li><a href="https://woocommerce.com/products/product-bundles/" rel="nofollow ugc">WooCommerce Product Bundles</a></li>
<li><a href="https://woocommerce.com/products/composite-products/" rel="nofollow ugc">WooCommerce Composite Products</a></li>
<li><a href="https://woocommerce.com/products/conditional-shipping-and-payments/" rel="nofollow ugc">WooCommerce Conditional Shipping and Payments</a></li>
<li><a href="https://woocommerce.com/products/product-recommendations/" rel="nofollow ugc">WooCommerce Product Recommendations</a></li>
<li><a href="https://woocommerce.com/products/all-products-for-woocommerce-subscriptions/" rel="nofollow ugc">All Products for WooCommerce Subscriptions</a></li>
</ul>
<h3>Documentation</h3>
Dependencies are evaluated when customers attempt to add a product to their cart. If validation fails, the product cannot be added to the cart and a notice is displayed. In order to evaluate “Ownership”-type dependencies, customers are prompted to log in.
<h4>Creating Dependencies</h4>
To add dependencies to a product:
<ul>
<li>Go to the Product Data > Dependencies tab.</li>
<li>Use the Product Dependencies field to search for and add some products and/or variations.</li>
<li>Choose a Dependency Type.</li>
<li>Update to save your changes.</li>
</ul>
The “Ownership” dependency type is evaluated by checking if the customer has purchased a required product in a previous order. The “Purchase” dependency type requires the customer to have a required product in the cart in order to purchase the dependent one.
<h4>Ownership vs Purchase</h4>
The plugin allows you to select between 3 different dependency types:
<ul>
<li>Ownership: Access is granted only to customers that already own any of the products added to the Product Dependencies field.</li>
<li>Purchase: The product can be purchased only in combination with any of the items added to the Product Dependencies field. Ownership is not taken into account.</li>
<li>Either: Access is granted with ownership or purchase of any item added to the Product Dependencies field.</li>
</ul>

WooCommerce Product Dependencies

WooCommerce Product Dependencies is a well-built plugin that does one thing really well. It allows you to restrict the purchasing of a product unless certain other products have been purchased previously, or you have certain other products in your cart (and purchase them alongside the main product).

The UI fits right into the WooCommerce admin design. Super-simple options. Very clear how to use it. Great documentation on the WordPress plugin page.

And Jason provided fast & thorough support when I reached out with a question.

I'd highly recommend this plugin for anyone looking to set up WooCommerce product dependencies.

Works perfectly. Designed well. Does one thing really well.

Restrict access to any WooCommerce product, depending on the ownership and/or purchase of other required products.

Stock Dependencies for WooCommerce vs WooCommerce Product Dependencies