Moving Music library to Mac Mini internal drive

Hi there,

This might be a complicated question: I recently bought a new Mac Mini and I've had my Music (iTunes) library on an internal SATA HHD attached to my older Mac Pro 7,1. Now this HDD is networked on a NAS of my own. But I'd like to move all the music files to the internal main disc of my Mac Mini. Problem is that not all the folders inside the "root" location of my old library are connected and actually imported into iTunes/Music library, so the "consolidation" operation should be selective. How can I automate all this without losing the links to files in the process? Thanks in advance!

PS: the present Media location of Music library is already in :" ~/Music/iTunes/iTunes Media" even if most of the files are still linked to the external HDD.