How do you move the center point on a drawing

Hello, I have a drawing imported from a dxf with a center point(x0y0) in the middle of grouped drawing(off center not that it matters).  I want the center reference(x0y0) to be at the bottom left corner.  I can click and drag the center point, however, this does not "anchor" it and change anything(just shows the circle with the dot but not the X).  I want the center reference point to be in the new location when I export the dxf again.  I goggled and cant find a solution please help.  Thanks.