How do convert part of a treble staff to a grand staff for a few bars for a two handed song ending?

I was able to do this function in finale for some time now but I have yet to find the way in Dorico 3.
Is this possible? If not is there a special way of importing an uncompressed MusicXML 3 file from Finale 26 to do it?
Thank you.

Right-click an item on the existing staff, then go Staff > Add Staff Below (or above). Use the Bracketing tool in the left panel of Engrave mode to bracket or brace it as you wish.

Thank you for your quick reply Pianoleo. That took care of it perfectly.