I want to reconfigure playlist's songs file path, NOT re-add the songs themselves

So i had a playlist which the Contents folder was situated on an external HD and i deleted that folder. The playlist now has missing files (original songs all on my laptop) and I simply just want to relocate the missing songs to the original locations (my laptop), but it rekordbox then says the song is already in the collection. i am aware it is in the collection but i merely want to reconfigure the location of the songs that are missing in the playlist, NOT in the collection?

Thanks! 

Luc