Honeybee Split building Mass not available anymore?

I am trying to break down a building into core and perimeter zones.
I’ve just learnt about Honeybee Split building Mass tool, however it is not available on my toolbar.

Has it been removed or would there be a way for me to add it?

Hi @Navid.E, I’m not sure how helpful this will be because it sounds like you already have your model made, but you can use the
'HB Straight Skeleton' component to create core and perimeter zones from surfaces or closed curves, and then extrude the core/perim surfaces to make the rooms.
core_perim
hopefully that’s helpful
-trevor