Indesign CS 5.5 Page Numbers

Hi,

I have a large file that I would like to have two separate page numbers going on.

I'm designing a magazine with a submagazine in the file. I would like it to be all one file.

Is there a way to have two separate page numbering going on at the same time.

The magazine is 60 pages, but by page 31 for the next 20 pages is a separate magazine then I would like the page numbering to continue from before. (ie 29, 30, 1, 2, ....20, 31, 32)

Is there a way to do that? (I'm working on a MAC)

You comments would be very helpful.

Thank you!