Some users have documents which repeat every X pages and they want to treat each part as a separate document, e.g. printing the first page to one tray, then the next X-1 pages to another tray, then to go back to the first tray again. To do this, just select the length of each segment on the settings dialog where it says “Apply these settings to all pages” by clicking the + or – buttons. Tray Selector will then split the document up into segments of this size and print according to your settings. Please note splitting is only done for the main print settings, not the extra copies.
Tray Selector can be used this way to split up a word document into segments and print each one the way you want.