Massed entry works in conjunction with a program of events.
If 100m trial results are being collected under massed Entry, then there is typically a program of events with Age/Gender 100m events on it.
At any point you may process massed results into those events.
Option 1 sorts the competitors by Age/Gender and puts the best as competitors into the relevant event(s) on the program.
Option 2 adds competitors but goes a step further and pretends the event was actually run with those performances and processes the vents, generating Team and Individual Scores