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Page status (reviewing guidelines)
Object mode Adding object - menu, manual selection - is under last added object... or shortcut ⇧ ShiftA.
Edit mode: adding object -> addin mesh, e.g. final merging into one object.
center for adding: X 3D curson. If you need to center cursor imed. just press ⇧ ShiftC, or edit in the N tools menu cursor xoordinates x,y,z. Content proposal from Quark66 12:53, 11 June 2013 (CEST):