Lots of UPS mailing labels (which are half of a letter page) are sent to me with instructions that I don't want included on the top half of the page and the actual label on the bottom half. I print several of these most days and would like to automate or at least speed up clearing the top half of the page so I don't waste labels by printing instructions on them.
My first approach was to crop the top half of each page by using Print Production --> Crop, top 5.5", then combine that label file with that of any others I would be mailing soon, and then setting up my print menu to print two of the resulting half-letter-sized pages to a letter page. That's time-consuming, no good for an odd number of labels, and forgetting to change the print settings back to normal (for non-label printing) every once in awhile leads to a few dozen wasted pages. (When I don't add a second file and try to just print one cropped-page label by itself the print menu automatically decides to screw around with the size/orientation of the label.)
My second approach has been to manually redact the top half with white redaction, but that's also more time-consuming than I feel the overall process perhaps could be.
If the area you want to remove is always the same it's possible to use a script to add a Redaction annotation over that area in all the pages of the file, and then apply those redactions. This script can even be attached to a menu item, so you could run it with a single click, basically.
This will require a bit of scripting know-how, though. If you're interested in hiring someone to develop it for you feel free to contact me privately via [try6767 at gmail.com] to discuss it further.