Straighten face

[Anonymous]

Hey there,

I made Revolve of sketch, but i need bottom of part be straighten as i mentioned with red lines, However i do not want make extrude because i want top side be contiguous, like touching the surface of big body

[etfrench]

On the right hand face of the grey area, create a sketch. Draw the profile of the grey area. Extend the profile into the main body such that when the profile is extruded, the inner side will stay inside the main body.  Use Combine|Cut to remove the excess if the grey area is a separate component, or Join if not.