Hide tax for the same group but in a diferent store (Multi)

[NIKESLB]

Hi,

I need help please about the tax. I have 2 store (multistore) and by default we have the "customer" group. At this moment we have like 8000 customer in a store (A) in the customer group. In the other store ( B ) we have 150 customer in the customer group as well.

 

How can I hide the tax for the customer group but for a specific store? The multistore function doesn't work on groups, do I really need to create a new group and insert every member to this new group?

 

Thank You

Edited May 31, 2017 by NIKESLB (see edit history)