Business Rule

Hi,

I'm testing the service desk functionality. Regarding the business rules I have read that they are site specific. But I have a doubt:

I have different sites I have specific teams for every site, but I have some teams that are global, then I want to create a business rule that runs for all the sites, with that rule I want to assign the tickets based on certain category to a global group. I'm able to create the rule at the default settings (Bussiness Rule for) but it seems that it doesn't run; when I create a ticket is not assigned to that group.

I neither the group can be member of more than one site.

How can I solve this situation ?

Regards