Konica Minolta bizhub 200 - Manual (Page 223)

Setting up the VXL/VPS driver (Windows Vista) 7
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From the Save Custom Size dialog box, the selected custom paper size
can be deleted by clicking the [Delete] button. To edit a custom paper
size, select the custom paper size and change the paper name and paper
size.
The “Save Custom Size” function is only available with the Windows Vista
PCL driver (VXL).