Answered
binding margin
How do I insert a gutter or margin in an existing pdf to allow me to comb bind a large document?
How do I insert a gutter or margin in an existing pdf to allow me to comb bind a large document?
Please try "Crop Pages" option under Edit menu in Acrobat application.
Go to Edit menu > Crop pages and double click on page. You will get "Set Page Boxes" dialogue box. as shown below in screenshot.

Check if it works for you.
Regards,
Meenakshi
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