copy existing text into the replace text comment box

when i'm doing comments on a PDF, I often will have multiple edits within a sentence/paragraph. I would like to copy the existing text into the "Replace Text" field, edit it there ,and have the designer replace the entire block of copy rather than have them make multiple edits. It just seems more error prone to ask the designer to make 5 edits in a sentence instead of 1. But I also do not want to introduce a new error by retyping the entire block. Is this possible

scott