how to switch from catia surface design to part design and sheet metal design

lets do it

2 Answer

Klick on Start and choose the workbench ;-)

Answered with a tutorial: https://grabcad.com/tutorials/how-to-switch-from-catia-surface-design-to-part-design-and-sheet-metal-design

Each of these three workbenches is used to create and edit different types of geometry.

So the follow-on question should be: "How to use geometry from one workbench with the other workbenches?"