It would make sense and save time that if you search for a constituent in the relationship screen and are unable to find them then you could have the option to add them, otherwise you have to back out of it and go to a whole new screen to add them then end up right back at the relationship screen.
Please revisit this request. It is a time waster to have to go back out to the main screen to add a constituent. If one is not found a we get a message stating "constituent not found", a click button of "add this constituent would make sense here"