There's a way i can set tags to services for browsing purposes. As you know, you can search for a service through a word on the service name or a word on the description but a customer we'll like to know if he can add tags to search through those tags.
Yes, you can set keywords in a Service and then you should be able to find the service using those keywords. See:
Manage Service Options and Service Option Elements - CA Service Management - 14.1 - CA Technologies Documentation
Hope this helps.