PIano melody in two pentagrams

Please I've spent almost one hour trying to search on google this topic but I don't really know the terms to describe it.
I'm writing a piano piece and I need to write a melody line that goes from the low pentagram to the high pentagram, made for the right hand, while the left hand notes are written also in the low pentagram.
Here is a picture of what I want to do.

As you can see, in the picture there is the right hand melody that goes in the low pentagram but also the left hand bass notes are displayed.
How can I do that in musescore?