Sketch on the Face of a Part
To create new features on a part, you sketch on the face of the part where you want to locate the feature.
To sketch on model faces:
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Select the planar model face on which you want to sketch.
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Click a sketch tool on the Sketch toolbar, click Sketch 
, or click Insert, Sketch.
The following happens:
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 A grid appears on the face that you selected (if you selected Display grid in Tools, Options, Document Properties, Grid/Snap).
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To sketch on a different face, exit the current sketch, select the new face, and open a new sketch.
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You can also use RapidSketch to open sketches on any planar face or plane with an active sketch tool,
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