I think the screenshot explains it better than any clumsy formulations of mine. – I have no troubles with adding a second voice to created a “melody” out of the “accompanying figure” of 16th notes. But I wonder if there is an easier method, like “add a second up-stem on selected notes”?
Also: how do I created that kind of cross-staff beams, when there is more than 1 voice?
The settings should allow for such beaming, but the result proves otherwise… (Do I have to change the stem direction manually?)