This not a question of how, but of where. I want to geo-merge several double boxes at an angles using stairs in it's normal state. (This will create a ramp.) How do I know where to put everything so I can have it exactly where I want it?
Line up all the stairs exactly using a double wall or double box, then keep placeing double boxes or w/e on the stairs. If you want to place more than one set the other boxes to not spawn on start.
Its easiest to put the bottom of the stairs at the bottom of wherever you are going to geomerge your object. If you are going to geomerge it straight into the ground, then you are going to want to line the stairs up with what you are going to have your ramp to.