The To Bezier command will allow you to select an Arc or Line and turn it into a Bezier Curve.
Turning an Arc or Line into a Bezier Curve
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Select the Vector Edit tool image\Vector_Node_Edit_tool.gif.
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Select the Arc or Line you wish to change into a Bezier Curve.
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Select the To Bezier tool image\To_Bezier.gif or press the B key.