Something I use a lot is the wirecut command to rapidly split and trim solids.
The default command however is not perfect in this regard, since it still needs way to many mouse clicks IMHO, my goal is to minimize these in commands I use very often to save time.
I use this macro from @rajaa to speed it up:
_Wirecut _Line _Pause
_Direction=_CPlaneNormal
BothSides=Yes
_KeepAll=_Yes
_Pause _Pause _Enter
this let’s the user draw a temporarily line to split a solid into 2 parts .
While this is great and → IMHO should be a regular Rhino command
It does not work in some cases, you can find the discussion here: