Splitting an mkv with two separate 'Titles'

I have an mkv of Butterfly Effect, which has two different versions (Theater and Directors Cut). Using a VLC player you have to switch versions under the menu Playback>Title>Directors Cut or Theater ( https://i.imgur.com/4bZzoLh.png ). The Directors Cut has 10 Chapters, and the Theatrical Cut has only 1; however, when using MKVToolNix it shows 11 Global Tags (assuming 1-10 is Chapter 1-10, and the 11th Tag is the Theatrical Cut).I just want to split these two versions/titles into two separate mkv’s, and the MKVToolNix GUI doesn’t give me any options for splitting Global Tags/Chapters. Any ideas?