Create a single product listing with variants that comprises of individually stocked items

[scom]

We currently sell a product that has a number of variants (e.g. switch type and cable length) but they actually comprise and are stocked as individual switches and cables. 

The issue with a single product listing is that it can not track stock of the cables or switches so presumably the solution is to add a listing for the switch and a seperate listing for the cable, then "combine" the listing. If you search for this feature you find this - https://help.shopify.com/en/manual/products/combined-listings/create-combined-listing however it seems out of date as the app does not work anymore 

So my question, what is the correct way to achieve this now?

[EcomGraduates]

Shopify removed the Combined Listings app, so the method from that help article is outdated. But you can still achieve this using bundling apps or Shopify Functions 

1. Use a Bundling App 

2. Custom Line Item Properties – If you don’t want an app, you can modify your theme to let customers choose the switch and cable as options, then add them as separate line items in the cart while still making it feel like one product.

3. Duplicate Listings + Cart Automation – Another option is to list switches and cables as separate products but use Shopify Flow (if you have Shopify Plus) or a simple custom script to ensure both get added to the cart together when a customer picks a switch.