Use of two time signatures for the same score

Hello,
I have a composition in which certain instruments play in 12/8 time signature, whereas others play in 4/4.

I did it in Encore quite easily, but don't know if I can do it in MuseScore.

Of course, there are tricks one can use (such as tuplets for the 12/8 signature), or adapt the notes for the 4/4. However, g=having two time signatures would be much easier...

Thanks for any help.