OrCAD PCB Designer Transistor Footprint
Select the symbol, right click and show element.  This will give you the footprint name.  Find the symbol_name.dra file in your footprint libraries.  You can either edit this one or make a copy.  Open the footprint with allegro.  Now you can edit it to your heart's content.  

If you made a copy of the footprint you'll have to change the footprint name in your schematic and re-import the netlist.  If you did not go Place->update symbols.  Select package symbols and hit refresh.  It should bring them in.