Wall Covering: Wainscot Wrap

[Winans]

How do I get my wall covering that I am using as wainscot to wrap around my openings? Doors used for these openings do not have casing.

I've tried interior wall material but that covers the entire interior and I only want it to go up to 4' AFF.

I can take a lot of time with polyline solid, but there has got to be an easier way.

I'm using v10.something
I've tried to attach a jpeg of the area I'm referring to.

Thanks for the help.