New to replying, i think the solution is to track inventory on a SKU level and do inventory in Square.

The integration should take square sales apply them to QB and update the inventory in QB.

My items are SKU based and each SKU is different for each variant in my case.

Next i have an online store, in my store i choose to track inventory in QB and connect them together, this pulls online sales to QB and adjusts the inventory on my site per the data in QB.

I have a third party software that i will use to connect my online store to my QB as it will be needed later to connect other online channels like Amazon. I do not have this set up yet but my issue always comes back to inventory and keeping it in sync. I think this will work setting it up this way, QB please let me know if you agree the inventory would update when square sends sales over to QB as the SKU's will match.