Am looking into simplifying the options showing for customers wanting to submit a ticket...

So instead of seeing the above screenshot of options, would like the initial categories to be for example
* Log an issue
* Log a request
and remove the Common Requests, Computers, Logins and Accounts, Applications, Servers and Infrastructure to again just have the x2 bullet point items
Is this possible?
If so, where do I go to customise these options?
Thanks in advance :-)