Q: Preps and numbering tickets

[colotus]

I'm having InDesign CD, Preps 5 and Xerox DC3535 to make tickets. There are going to be 300 tickets and each will have its own number, like the first ticket ia 001, second is 002 ... last is 300. Ticket's width is 210 and height 99. So there will be three tickets per A4 - 100 A4's.

When the whole thing is printed and I cut the pile of A4's into three pieces I want the tickets order to be so that under 001 is 002, under 002 is 003 and so on. The last ticket's number under the first pile is 100, the second's pile's first ticket is 101 and the last ticket in the second pile is 200 etc.

Any ideas how I'm going to create the imposition to do this?

Thanks