Create new Parameter group and new Parameter in system families?

thx…very funny why can’t own group…:((

Not really, there are probably a few reasons why you would want to limit users to a closed set of groups. If we could create any category or group we wanted, BIM would get a whole lot more tedious where everyone had their own standards for groups and categories and also no standards at all.

Maybe…but I send this request to the new revit