how do I merge lines in a sketch?

I guess I'm special.....
How do I merge two lines in a sketch? For instance, I have two centerlines
because I imported stuff from another sketch. I make the lines coincident
and erase one but then I lose some dimensions. I would like to make the two
lines one line so that I don't lose the realationships.
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"Repair Sketch" in the "2D to 3D" toolbar can have this effect on collinear lines with common endpoint.
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