Steve,
It all depends on what you mean by category. If category is a "ministry" where there is an "Outreach Ministry" and "Adult Ministry" and you want to put it under both, then the WEC Servant Connector does not support that.
However, if you setup skills/interests so that there is "Outreach" and "Adults" as the interests selected for a specific opportunity like "Outreach To Adults in Downtown XYZ", then it definitely does support that. You can have up to 8 skills/interests to match with a given opportunity. You can setup the skills/interests separately, and then as you build the servant opportunities, you just select which skills/interests you want to match with each one.
If you have any more questions, let me know.
-Dave