Greetings, Michael!
Here’s a simple example:
Create an instrument track, even a blank MIDI part from bars 1 to 84, set the time signature from bars 1 to 21 to 4/4, and from bars 21 to 84 to 12/8, save it, and export the dawproject.
test cubase.zip (18,5 КБ)
Close Cubase, then open and import the newly saved dawproject. This is what we see in the screenshot: the total number of bars has decreased to 80.8, and the start of the transition to 12/8 has shifted from bar 21 to bar 11, something like that.
test dawproject.zip (2,0 КБ)
Sincerely, Sergey