How to delete Service category

How to delete Service category

Hi all
i have SDP Standard 13001
i'm trying to delete default service category
when i try, i got a message saying

Service Categories [Application Login] were not removed as associated templates are active.

i already deleted all default template from:
Incident Template
Task Template
Reply template
Resolution template

Where can i find other templates related to service category?
Any Help appreciated

                New to ADSelfService Plus?