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Select a fill surface.
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In the FILL SURFACE selection panel, select Edit Curves EDIT.
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In the Fill Surface Creation Wizard, select a curve in the list and click REMOVE SELECTED.
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In the work area area, select one or multiple other curves.
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The curves are added to the list.
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Click Finish to apply the modification.
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Select an input point of a curve.
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In the context toolbar, click Move
and move the point.
The fill surface turns to red color that indicates, that the surface needs an update. 
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Click in the work area to finish the modification.
The input curve and the fill surface are updated. 
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Select an input curve.
A handle appears at the curve end point nearest to the pick position. 
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Manipulate the handle to modify the curve's shape.
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