When you work in MultiStore mode, PrestaShop allows combination groups to be available in specific shops.
In Store Commander interface, you will find the sharing option in the attributes panel within Catalog > Attributes and Groups > Attribute and Group Management
You simply need to tick/untick the shops to associate/dissociate groups to/off your various stores.
Following the multistore sharing principle used across Store Commander interface, you can of course select multiple groups to associate/dissociate in bulk!
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