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Relative Math Formula for multi-selected components

I would love for the ability to somehow indicate to use the existing number within a formula.

 

For instance, I would like to select a door and a window. Obviously, these both have a different "sill height" (though I'd love this to work for Base/Top Offset, too). Having both selected, the Sill Height parameter is shown as blank (as is typical). I'd love to be able to type a formula to lower them both by, say, 2'-0".

 

This would, of course, base it off of whatever value each instance has for that paramater. Something like:

=X-2' which should then substitute the instance value of each element for X and then do the math.