How to link Main Tab fields to your PIM Tab?

To ensure that the values from your Main Tab are carried over to your PIM Tab, you can link them together. For this purpose, there is a linking symbol next to all fields in your PIM Tab. From the dropdown menu, you can select the Main Tab field that you want to link. When listing on the marketplaces, the value from your Main Tab is automatically transferred to the marketplace.

Below you will see the symbol that is referred to, and from the dropdown menu, you select the reference field from the Main Tab.