# Definition Sketch
Set a new datum or surface for the sketch you have created.
1.Right click on the finished sketch feature or sketch in the viewport and select [Edit Sketch Definition] to bring up the Replace Sketch Plane dialog box:
- Plane: display the datum plane/plane of the current sketch, you can directly click on the face to be replaced in the viewport, the option box will automatically replace the newly selected datum plane/plane;
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1 Original state | 2 Changed State |
- Click [OK] to finish replacing the sketch plane.
- If there is a conversion boundary element in the sketch, re-project it after changing the sketch plane. If the projection does not conform to normal logic, the sketch line after switching the plane will remain consistent with the previous one, and the corresponding conversion boundary constraint will become an error constraint state, and the sketch can be restored to normal after deletion。