I'm creating a light family. There are different lights, all having different configurations of their own. What I want is that if the user selects 'Light A' from the dropdown, the next dropdown should show different configurations of Light A only, and not all the configurations of all the lights.
The following is just an example of the process I need
First drop-down:
Showing all the countries of the world
Second drop-down:
Showing all the States of the country selected in the first drop-down
Third drop-down:
Showing all the cities in the state selected in the second drop-down.
The above example was just to make my point easier to understand.
Is there any way to achieve that?
By drop-down, I mean the label parameters we set on nested families.
Following are two screenshots
The Family Type parameter / selector. Don't think you can make it work as you describe - Revit Formulas don't do string operations, which you most certainly would need to accomplish your goal.
So is there no way to add some formulas like (If "United States", Alaska, California, Florida, ...etc)
So if a user selects the United States, the second label parameter filters out the results to show only the American States.
Sadly, no - formulas lack a lot of functionality. I'm sure it must be possible with Dynamo, but that's a whole different thing.
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