Area Boundary to interior face of exterior walls

I am looking to add an AREA BOUNDARY line to an AREA PLAN view to the INTERIOR finish face of WALLS which have the EXTERIOR function.

Great. What have you tried so far? Have you looked for other posts dealing with each of those topics?
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Hi Nick, thanks for responding. I have gotten as far as the image attached. My issue now is how to convert the line to an area boundary, and if it is possible to trim/extend the interior line.

It looks like the node you have for area separators takes curves and you have the boundary curves from the walls. There are also trim and extend nodes for curves (e.g. Curve.TrimByParameter and Curve.ExtendStart/End) that should come up if you search for them.