No. Importing listings will not overwrite manually linked listings.
If you’ve manually linked listings with different SKUs to the same product, Sellbrite will preserve those links. For example, if you linked 5 listings to a single product manually, that relationship remains intact.
When importing listings and selecting the option to create products, Sellbrite skips any listings that are already manually linked to an existing product. Because those listings are already linked, they are not used to create new products, helping preserve your existing product relationships.