You can make CamBam curve fit a polyline using the "edit/polyline/arc fit" menu option.

E.g.

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You are prompted for the tolerance so you can choose the tradeoff between accuracy and minimising the number of curves.

CamBam has a very good forum for asking these sort of questions. It is also deceptively simple and it's worth (never thought I'd say this) reading the manual to find out all the things it can do.