Revit Model Family and visibility parameters

[quinlan_burns-ray]

So I don't know how best to word this, but I'm looking to see if there is a formula to use for designer adjustable visibility with reference lines. I have adjustable dimensions using the attached if/then formula, and I can make simple yes/no toggleable visibility elements using the instance parameter, but I'm wondering if there is a similar if/then formula that when content is above a reference line, it hides the element in project, so that the element doesn't shrink in size when you shorten the reference line, but rather you keep the same amount of and size of the elements, like seen in the attached 3D view. Any ideas? Or at least, an idea for an alternative?

[vitorbortoncello]

Use an If/Then formula in the Yes/No parameter like: Length > Reference Line