Xerox 4112 System Administration Manual page 70

Setups
Note
When you want to specify the number of sheets separately, use the set Variable-Sheet
Booklet option to make the proper selections.
11. Press Sample Printout again to print an output sample, and check the adjustment results.
12. Make adjustments again if necessary. (Steps 7 - 10)
13. Press Save.
C Fold Position Adjustment
Adjust the C fold position.
1. Select C Fold-A4 or C Fold-8.5x11", and press Change Settings.
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Xerox 4112/4127 EPS
System Administration Guide