Eureka ! Subtracting Holes from extrudes

[Scott Pointon]

Have quite often created complex profile shapes, extruded these then find cannot subtract holes from the extruded item. Getting a message cannot calculate please edit or crashing the program. I was redrawing the complex shapes from scratch trying different methods of clipping and adding surfaces until eventually creating the object. Have now found if you edit the profile shape with the 2D Reshape tool. Then move around the vertexes making up the profile shape you find a number of these are doubled up or a number very close together, by deleting the excess vertexes from profile shape you are then able to subtract from the extrude.