Is there something I`m missing about this simple problem? You have a wall where the core center is not the same with the wall center. You draw the wall based on Center Core Location over a Grid. When i try to lock to the grid this center of core i don`t find it using TAB ....only wall center. Or when you draw the wall you don`t have a check box for automatic locking to the grid based on Loc Line of the wall. The only way to do it is to put a dimension from the grid to the face of core and lock it and then Hide in View the dimension?