Using the Split Tool to partition the solid is a good way of doing this. There are lots of ways you split the solid, but an effective option here is to create a sphere or box in the appropriate place (using the geometry primitives), then use that to split your solid:
Using the Split Tool to partition the solid is a good way of doing this. There are lots of ways you split the solid, but an effective option here is to create a sphere or box in the appropriate place (using the geometry primitives), then use that to split your solid: