When you are creating Revit family’s using circles (especially Profiles) it can be difficult to constrain circles to parameters or relocate the profile. An easy way to help with this process is to have a visible Circle Center Mark. This will allow you to align, move, lock or constrain with parameters using the center mark as a reference point, which is not possible without it.
Just select the Circle and in the properties tick the Center Mark Visible Parameter.
Now you have a point to reference.