how to create a new category of existing categories

Hello,

I need to create a new category of existing Categories or at least clone the existing category with a new name, how can I do that.

I need this for traffic shaping,

for example, if I need to allow all "streaming websites" for the user with a limit of 128KB/s

and for managers with a limit of 512KB/s

knowing that we set the traffic shaping limitations is set for the category itself, not on the firewall rule

so i can't use the same category with 2 different traffic shaping forms.

any solution ???