If you wish to list the same items multiple times on the same channel please follow this: https://help.linnworks.com/solution/articles/7000010297-ebay-creating-multiple-non-variation-listings-from-one-inventory-item
The correct ones would be EBAY1_1_US, EBAY1_2_US.
Let us know if you have any other questions.
If I have a Shopify store is the same way my shopname_1 and shopname1_1?
Please try this way:
listing the different title for the same product.
I want to list product A
Title1: Brand 1 Subsource EBAY1_US
Title 2: Brand 2 Subsource ??
What is the right the SUBsource for the second title EBAY1_US_1 ?