You can create, edit, or delete sketches.
To create a sketch in a part or assembly file, do one of the following:
or Start 3D Sketch
.
.To create a sketch in a drawing file, click Place Views tab > Start Sketch .
Do any of the following:
Use commands on the Sketch tab or 3D Sketch tab to add geometry and apply constraints, dimensions, and features.
To reference other dimensions (parameters), select the feature to show the dimensions used to create it and click the dimension value you want to reference. Or, during sketching activity click another dimension to reference it.

You can copy and paste a sketch from one face to another and from one component to another. Depending on the paste command you choose, user parameters will be copied and pasted.

Select and right-click the source sketch, or simply right-click it, then click Copy.
Right-click the target face in the same or other component, and click:
When you cancel a sketch, all current actions are discarded. If creating a sketch, all actions are discarded including the creation of the sketch. If editing a sketch, all actions during that edit sketch operation are discarded.
To cancel a sketch, on the Sketch tab click Cancel Sketch.

You must finish a sketch to exit the sketch environment.
Select the sketch in the browser and press Delete or right-click it and choose Delete.