Oki C 9400 - Manual (Page 211)

4. Select a Unit of measure, then enter the Width and Length you wish to use.
5. Enter a Name (up to 12 characters) for the custom page size, then click Add.
The name appears in the box.
6. Click OK.
The name you entered now appears at the end of the Media Size drop-down list.
7. Click OK and close the Printers dialog box.
Printing Using a Custom Page Size: Windows NT 4.0 PCL
To print using a Custom Page Size in the Windows NT 4.0 PCL driver:
1. Open the document in your software application.
2. Load the custom print media in the Multi-Purpose Tray.
3. Make sure the straight-through exit tray is open.
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