Use one common list of problem types for all categories.

Normally, you have to define a list of problem types for each category. However, if you have one common list of problem types for all categories, you can avoid defining the same problem types list for every category. That is, if you have a common problem type for all Problem categories, you don’t need to add the same problem type for each category. Just leave the Problem Category column empty for that problem type under Helpdesk Manager > Problems List.