Consolidate Voices

Hello! I'm using version 2.0.3 revision 3c7a69d to refine a piece I recorded in Logic. When I imported the MIDI files from Logic, it made multiple voices in some sections because notes overlapped. Since the instruments I'm using are both percussion instruments, the length of the MIDI note didn't matter much in Logic, but in MuseScore it does. Now I have extraneous voices that I want to consolidate but don't know how to do. I've imploded the score and tried copying and pasting and it hasn't worked. What else can I do?
Thanks!