Adding another part to my part

Hi! Quick Q:

I’m writing a Cello and Piano Duo. In each part, I would like to show both instrumental parts, i.e. the cello part has the piano part as well, but the staff size of the piano part is smaller to remove emphasis. How would I go about this?

Thanks!

In Setup mode, click on the cello layout to select it. Then check the bow on the right to add the piano to it.

Then in Write mode, click on the piano staff (anywhere), and Edit–Staff Size.

Perhaps good to mention that you need to have selected each layout in the popup window at the top before resizing the staves, otherwise the change will only affect the full score.