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Click Marking Command
.
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Select 2D Projection from the Mode list.
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On the Marking ribbon, click Part
.
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Select the part to mark. You can select the parts in the model, or from the Workspace Explorer. A red arrow indicates the side of the part on which the markings are placed. Select a different value from the Side list to place the markings on a different side of the part.
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Click Sketch 2D
, and then click Sketching Plane 
and specify a sketching plane.
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Click Sketch 2D
, and sketch the marking line.
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Click Finish on the ribbon in the 2D Sketch environment.
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Click Select Related Part
, and select the related parts to receive the marking line attributes. You can select
the parts in the model, or from the Workspace Explorer.
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Click Properties
to review the marking attributes. The attributes that display depend on the type
of marking after the selection of the related part. For example, the Connection GUID, Related Part Name, Direction, and so on may display.
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Click Finish.