Each movement in a piece should have its own work registration and each movement's recording(s) should be matched to its respective work registration. Creating a separate work registration for each movement will improve our ability to match that work with its recording usage.
As a reminder, matched recordings are what lead to royalty distribution. The MLC can only distribute royalties when recording data is matched to a work registration. When registering each movement, you may also want to add an alternative title to include the name of the full piece.