How do I move entire lines of a document in Acrobat that already has thousands of check boxes and field entry lines?

I recently added check boxes and organized a large pdf document for a client and he now needs an additional line of text to be entered in the middle of the document.  I already tried exporting to word then back after making the revision, but all the check box values are gone.  And to add the text in Acrobat it only allows me to enter into text boxes, not a flowing page like Word does.  I also can't simply hit enter and move all lines down in Acrobat like you can in Word, so what can i do? thanks.

Line "i" needs to include another lines worth of text inside the parenthesis, but its two different text boxes, and how can I make the entire form shift down a line without messing anything up?