You can create, edit, or delete sketches. 
 Create a Sketch 
- To create a sketch in a part or assembly file, do one of the following: -  On the 3D Model tab, click Start 2D Sketch  or Start 3D Sketch or Start 3D Sketch . .
- Right-click in the browser and choose New Sketch or New 3D Sketch. 
-  Click a planar face or work plane of a part and choose New Sketch. 
 
- To create a sketch in a drawing file, click Place Views tab > Start Sketch . 
 Edit a Sketch 
- Do any of the following: - Double-click the sketch icon in the browser. 
- Right-click the sketch in the browser and choose Edit Sketch or Edit 3D Sketch. 
- Right-click the sketch plane in the graphics area and choose Edit Sketch or Edit 3D Sketch. 
 
- Use commands on the Sketch tab or 3D Sketch tab to add geometry and apply constraints, dimensions, and features. 
 Finish a Sketch 
 You must finish a sketch to exit the sketch environment. 
- To end a 2D sketch, on the Sketch tab click Finish Sketch  or right-click in the graphics area and choose Finish 2D Sketch. or right-click in the graphics area and choose Finish 2D Sketch.
- To end a 3D sketch, on the 3D Sketch tab click Finish Sketch  or right-click in the graphics area and choose Finish 3D Sketch. or right-click in the graphics area and choose Finish 3D Sketch.