When you need a SOLIDWORKS profile sketch normal to model edge, for say a Swept profile sketch, hold off on generating a Reference Plane. If you preselect the edge close to the endpoint where you want the plane to be generated and select the Sketch tool…
Image may be NSFW.
Clik here to view.
Clik here to view.

Preselect Edge
…this will automatically generate a Reference Plane normal to the edge and coincident to the edge endpoint closest to where you selected – and start a sketch on this plane.
Image may be NSFW.
Clik here to view.
Clik here to view.

Reference Plane Generated
This will work for both straight and curved edges. Here is a video demonstrating this functionality to save you some time:
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