nisus.com

I have a 540 pages files I want to split in two without having to select, drag and paste the second half, which would take forever.
Nisus has a “merge” command, but I cannot find a "split" command.
I don't find a macro for this operation either.
Can anybody help me?
Thanks!

There is a split document macro here. There must be at least one page/section break in the document for the macro to work:
http://nisus.com/pro/macros/?activeCat=Document

Thank you ever so much Hamid! And thank you for the page break tip.
It worked beautifully after I took out all the page breaks but the one where I wanted to split.