Directory Plug In - allowing muti select (ie show me ads from Cat a and Cat b)

Hi Guys,
new to the system, used to using OSC, but not really WP, yet.

I have a question: Can I multi select categories?

If I create multiple categories I can create a listing, and in the edit screen I can add multiple categories to the advert (so it can be found under different links), that's great.

So when I go to the home page I can see the listings correctly matched to the Cat's, however there are times when I want to select 2 cat's (ie Computer repair and Town, or maybe computer repair, collection service and Town).

Can I do this? as currently I can only seem to follow the hierarchy down.