Is there a plugin that lets the user do subgrouping in beams, like in this image clip?
(https://musescore.org/sites/musescore.org/files/beams3.gif)
Ah, played around some more and found out I can do it without a plugin!
1) Select the first note of the new subgroup (no need to do this for the first subgroup).
2) Right-click > Properties....
3) In the Notes tab, check the Beam group start checkbox.
4) Press [Okay].