How can I assign individual product inventory to suppliers on Shopify?

Hey i am currently facing an issue with shopify’s possibilities.

The issue is the following:
I have a shoe-model which is for example a Nike Sneaker XYZ:

Nike XYZ is a unique product in my shop which has a sizing from US7 till US10:
US7, US7.5, US8, US8.5, US9, US9.5, US10

US7 is from Chris and another US7 is from Tyler for example.

I want to assign each pair to a person so I know whose pair got sold etc.

Is there a way to mark a single product to a supplier, or do I have to keep track of it in a Excel sheet etc.

Would be very nice if you guys know add-ons / apps which are making it possible since Shopify doesn’t provide a proper solution to that.

Greetings from Germany!

Hello! You should check out aravenda.com. It is consignment software fully integrated with Shopify. You can list multiples of the same products from different vendors/consignors with variants for condition, size, price and color.