title: Shopify custom bundle: Products listed as line item properties and inventory update on order
body: <p>I'm making a custom bundle "builder" with Shopify Theme Sections for my client and I managed to add products from the bundle as Line item properties (it's easier to remove it as only one item, then as 5+ items). Now I'm not sure how to finish the order process and update the inventory of the products listed as line item properties.</p>
  
  <p>How to "connect" the Cart and Checkout pages and transfer the info about the products, so it can affect the inventory after the order is finished? Should I add a hidden fields on the Cart page (for those products listed as the properties), or should I do something else (e.g. add a Private app with some hook that'll update the inventory in the background or maybe add all products to the cart page and hide them with JS and add some logic for their removal)?</p>
  
  <p>Here is the checkout screenshoot as an example - <a href="https://www.dropbox.com/s/j6cu985wcpfp4t9/shopify-cart-products-as-line-item-properties.png?dl=0" rel="nofollow noreferrer">https://www.dropbox.com/s/j6cu985wcpfp4t9/shopify-cart-products-as-line-item-properties.png?dl=0</a> </p>
  
  <p>Thanks in advance!</p>