Allignment of dxf file on a fixed size box


Hello I try to use the VX Spindle to engrave a dxf.
To place the dxf on a desired place on my material I canged the Stock to Fixed size box, put in the dimensions. Now I would like to change the model position fom Center to Offset from Center. But instead of the Model the Box moves.
If I move the Model in DXF arragement tab, the box moves with the model.
I need the Box fix on X an Y = 0 and the model within the box free to place.