What's your Preference for Preface?
Any preface can be printed just prior to printing the actual number. Or, you can choose to have no preface at all by setting (none). This is done in the Preface column.

Make the 2nd Number Higher
We need to split the run so the first half of the numbers will be on the top form and the 2nd half will finish on the bottom form. This is where the Add To First Number column comes handy.

If our finished quantity is 1000 forms then when running 2-up that's 500 sheets. Then the top form should be numbered from 1 to 500 and then bottom 501 to 1000. The starting number on the bottom form of 501 is exactly 500 higher than the number on on the top half. Enter 500 in the Add To First Number column so the program will respond appropriately.

Set your Starting Number and Ending Number and away you go. In this sample we used a printer that stacks face up therefore we wish to number in reverse. This is required so the first numbers finish up on the top of the stack. For reverse numbering click the button next to the word Decending in the lower right corner of the screen.

When you're finished your settings should look similiar to the screen below.