if I want to give different permissions to my technicians in different Office. how i can do it?

for example My technician work in tow office and has different role in these offices.i want to give him delete permission in one office and just create ticket in another one.how i can manage these difference.

in Service Desk Plus each person has one role in the whole of the system but i need to seprate these permissions up to his office.

how i can do it?

thanx

Best Regards