Konica Minolta bizhub C451 - Manual (Page 191)

Setting up the PCL driver (Windows) 5
C451 5-46
The new paper size is added to “List of Custom Size”.
4
Specify the paper name and size.
5
Click the [OK] button.
2
Note
Up to 10 custom paper sizes can be registered.
Up to 16 characters can be entered in the “Paper Name” text box.
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.