Solid Works support selected faces export into separate IGES file.
But how to export the selected edges into a separate IGES.
Tried it as below
1) Selecting required EDGE entities as, doing export to IGES with option set to export as type 112 entity.
2) Creating a "composite curve" feature. Selecting it and then IGES export with option set to export as type 112 entity.
In both cases, all the curves as getting exported as single sketch.