holes in the wooden columns of the porch
Whack the pole with a hammer a few times and see if you can stir the bees up enough to fly out. stick a piece of wire down there to get an idea of how big an opening there is and maybe spook them out. Last resort, spray some insecticide down there and then block up the hole with some caulk.
I don't think a few would be a major problem to the columns but you don't need a major nest around your immediate living area.