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Feature Set for Profile in Version 2021.1

Hi, I'm sorry if there is already a post explaining this. I did the search, but couldn't find it.
I'm trying to use a feature set (SCN) of points for linear profile. For some reason this particular program will not let me do it.
I literally did it yesterday on a different program. I was able to limp along by using legacy, but it is a substitute.

I know I'm missing something, but need you guys to help me.
Thanks!
Jason