Usually when I am recording MIDI parts on a drum track I will play one part and have the section loop over and add parts each pass. In Cubasis if I do 4 passes I end up with 4 separate midi parts one on top of the other instead of one. It’s quite a chore to edit drum parts this way. Please add the midi merge function such as the one in Cubase.
I have had this situation as well. Use the select tool and drag over the track so that all the sections are selected and then use the glue tool - voila, all the parts are combined!