Change number of lines for unpitched perc?

Current project uses 3 different sized triangles but Dorico only gives me one line which doesn’t show the different (un)pitches. Is there a way to get a 3 line staff or a workaround?

You need to create a percussion kit consisting of three triangles, and then show them as a grid. If you’re not familiar with how percussion works in Dorico, reading the Dorico 1 Version History PDF will give you a good steer, or the online docs will also tell you everything you need to know.

Thank you Daniel