Retrive geometry dimensions then use in a formula

[ALEXLJ.WORK]

Hi. I am setting up a bracing attached to a 150mm horizontal member. The thickness of the bracing is determined by the thickness of the horizontal member. I have aligned the profile so Revit will automatically adjust the thickness of the bracing (in this case it's 130mm). Now I need to extract the thickness of the bracing (130mm) to be used in a formula. 

The BracingSideTh is a reporting instance parameter which cannot be used in a formula. What would you advice? 

Thanks in advance. 

[barthbradley]

Simple. Don't use a Reporting Parameter. Instead label the Dimension with the exact same parameter that drives the horizontal member.  

...if it isn't that "simple", then provide a more robust description of how the family is built -- or just post the family here.  

...oh, and if you need the horizontal member's dimension parameter to "report" in Project Schedules, then make it a Shared Parameter.  

[ToanDN]

[barthbradley]

Not this?  

...hmm...guess not. Might be cheaper to miter uniform thickness members.  😉