Crop Tool - can you get it to select areas to be removed?

Question

The Crop Tool on my AAX selects the area to be retained.  Can you alter the tool so that it selects the area to be removed instead?
I'm trying to remove just the white space in the middle of a page.  My pages have some lines of text at the top, then white space in the middle, then more text at the bottom. A crop tool that identifies the middle white space and then removes it would be ideal - but there may be other ways?
I'm doing a trial of AAX Pro vs Nitro Pro OCR.

Answer 1

Thanks Bernd, I couldn't find it, and you've now confirmed it isn't there.
Michael asks me "   ... what do you want in the middle, if not white?"  Answer:  take the white out of the middle thus shortening the page.  Bring the footer text upwards to where the white space used to be.
I'm making the pdf equivalent of paper files.  So for example into each pdf I put A4 sized prints of emails, one per page.  Each email has maybe 5 lines of important text, then lots of useless white space, then a footer with additional important text.  I want to remove that central white space.  That would make the page much shorter than A4 but still same width, and retaining the footer text.  So that the file content can be read without loads of wasted space on the screen.
I accept now that the AAX cropping tool can't do what I want.  Nor I think the redaction tool.  But maybe there's another way to get what I want?