Merging Centerlines

Hi all,

Is it possible to merge two different centerlines, from the same part, that overlap. Currently I do it manually, but this takes a lot of time.

Attached is an image of the current sketch with the centerlines included. The extensions are exaggerated in this case.

On a side note, I have set the centerlines to a layer with its own color but the color does not want to show. I manually tried to set the color as well but no luck. Any advice would be greatly appreciated!

SolidworksDrawings And Detailing