Cap and Trim curved wall

Can’t figure out how to cap this wall with a surface. Used CAP command. Also tried creating a plane and splitting it using the wall curves but no luck. Loft didnt work either.

At the end of the wall there is excess I’d like to trim off…split and Trim didn’t work either.

Any ideas?

wall idea.3dm (4.5 MB)

I solved the cap issue - I was choosing the wrong Rail surface.

But I still can’t figure out how to trim the excess off the end.

Hello - explode the object and use the end cap to trim the extra bit off, then if needed, Join.

-Pascal

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Thank you!