How to divide a line that consists of an arc and a straight line?

I wonder if there is a way to divide a line that has one or more straight line(s) and an arc. I need to find a way, I use this for stair design. Know there are some good software programs for stairs but they are costly.

Fredospline

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Fredo tools includes an edge divider.

I installed FredoTools, in with one can find DivideEdges, but I have trouble finding it.

This weld edges trick does it!! But after “weld edges” I just right click and there is “divide edges”, just what I need! Thanks.