Contraining parts with slots

I have been assembling parts that have slots in them. What would be the
best way to constrain a part to another when one part has slots and the
other has taps? I don't see where you can use the axis constraint. I've
been making planes for the parts to get the middle of the slots to line up
on the taps. I would think there would be a better way.

Thanks,

Relz

 

The best way I have found is to have a sketch point in the center of the
slot, and then in the assy, mate that point to the temp axis of the tapped
hole.

WT