Apple Business Chat - Brand Question

The company I am implementing Business Chat for is Factoryoutletstore.com. I have a questionm about the Brands section.
We have mulitple urls for brand specific stores, a couple examples:
g.factoryoutletstore.com (Garmin products)
braun.factoryoutletstore.com (Braun products)
Now my question is in the brands section do I just submit for one brand: Factoryoutletstore.com or do I have to submit for EVERY single brand the company has a url for?
Thanks in Advance.