I am an advanced user of Inventor, I have just purchased Solidworks because I needed some features Inventor did not offer. Everything is going well except I can't find a way to slice my part and sketch on the inside of the part. I need to both be able to sketch on the inside of the part and treat it like a section view so I can see what I'm doing. In Inventor I would also project the geometry so I could pick the edges or center points of the area I had sliced . I know Solidworks has to have something like this because to me It would be a toy without it. And I know Solidworks is not a toy. What am I missing? The only comment I have found is where someone said to use the section view. I have not found a way to sketch on the cut area of the section view and pick the edges, points and so forth to snap on or use for dimensioning .