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Host Family to Read-Only or "Report" the parameter of a Nested Family

I need to be able to create a "Reporting Parameter" in a host family that does a "Read-Only" on the parameter of a nested family.

 

For example, I have a window family that has nested trim casing families that I can swap out from within the project using a family label parameter.  Each of these swap-able nested families has the same "trim width" parameter.  The window family has geometry that needs to change size based on how big the nested casing family is.  If the nested casing family can "report" it's width to the host family, then the host family can change the size of the geometry based on the size of the nested family using a instance parameter in the host family that "reads" the parameter of the nested family without changing the nested family.

 

There are so many families that I've created that would benefit from this feature!

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Enthusiast
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has this been resolved?