Create Form reference
When you click the Create Form tool on the toolbar, you enter the Form contextual environment in Fusion and a Form feature is added to the Timeline.
Design > Solid > Create > Create Form 
Form contextual environment
The Form contextual environment contains tools that let you create and modify T-Spline bodies.
- Create Sketch
- Box
- Plane
- Cylinder
- Quadball
- Face
- Edit Form
- Mirror-Internal
- Display Mode
- Offset Plane
- Measure
- Canvas
- Select
- Finish Form
Finish Form
Click Finish Form to exit the Form contextual environment.