I do not think this can be achieved currently because Properties (even when defined by Expression) always return element-specific data. What you are trying to achieve is an automatic summation of the values of a Property from multiple elements.
Yup, sum of values from elements. Since the actual sums of values are easily calculated with schedules I thought this was a low hanging fruit. I guess I had too high expectations for the "excel" like functions in 22. This area thing was the first thing I wanted to do...crap. Back to the drawing board...
Thanks anyways Lazlo..
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