What version of ArchiCAD are you using?
When you start to create or edit something, ArchiCAD presents you with an Edit origin, which is different than your Project Origing and your User Origin. It only appears when you start an operation so that everything is now based of that (Edit) Origin. It makes things easier, believe it or not. It can be relocated just like the User Origin. Look it up in the Help to get an even better understanding of it.