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Re: scaling sketches
No you can't scale a 3d sketch directly but create a surface using your original 3d sketch. Now scale that surface and start a new 3d sketch and using convert entities convert one edge into your final scaled up 3d sketch.
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Re: scaling sketches
Ram,
No like Deepak said, but you can scale the 2D sketch inside of the sketcher.
http://help.solidworks.com/2010/English/SolidWorks/sldworks/LegacyHelp/Sldworks/SW_Sketch/HIDD_MODIFY_SKETCH.htm