Oki C7100 User Manual page 142

(c) To define an overlay, click on the [Define Overlays]
button.
(d) Enter the file name of the overlay in the [Overlay Name]
box.
The Overlay Name must be EXACTLY the same as the file name you
made a note of in the previous section. This is the name under which
the file is stored on the printer's hard disk drive. It is case sensitive.
(e) Enter the ID of the file in [ID Values]. Please refer to the
user guide for the storage manager.
(f) Select which pages the overlay is to be printed on from
[Print on Pages], then click on [Add] followed by [Close].
NOTE
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