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From the Surface section of the action bar, click Flange
.
- Select the edge of the surface where you want to create the flange.
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In the Alignment box, select Shell Normal.
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In the Parameter area, enter a Length and click Apply.
The flange surface and two vectors are displayed. 
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Change the angle by drawing the first handle at the handle tip.
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Change the length by drawing the second handle at the base of the handle tip.
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Invert the flange direction by clicking onto the middle handle.
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Undo the inversion. Click into the middle of the guide and move the pointer to insert another handle.
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Select the Individual boxes for Length and Angle.
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Specify an individual length and angle by modifying the middle handle.
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Click OK.

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