Xerox CopyCentre C165 Quick Reference Manual page 79

If a second stock is required, use this option to program the inserts requiring a
Second Insert
different stock.
Tray
Select the Second Insert Tray option. Using the up/down arrow keys, enter the page
number of the first insert and select Add Insert. The page number displays in the
Insert Page as Side window. If a page number is entered incorrectly, use the Delete
Last Insert option to remove it from the window. Continue entering page numbers
until all the inserts requiring the second stock have been programmed.
Select the paper tray containing the second stock using the Insert Tray option on
the right of the screen.
Quick Reference Guide Page 4-31