Need digital signature to move as I type

Not sure if this has been asked or possible. What I'm doing is making a route sheet that will be filled in and signed electronically. The originator will also need to put their 1st initial,  middle initial, last name exactly 4 lines below the last line of typing then sign the document via certificate right above that.

I already formatted it so all they need to do is replace the name part with their info but need to know if it's even possible to make the signature box move with it as they fill out everything above it.