I often require the facility where I need to be able to select only one of a collection of options.
For instance, here is a list of items for a window frame section:-
The choice must be mutually exclusive so that when, say, steel is selected, aluminium is de-selected, and so-on.
The option chosen can then be used to select the profile to be used or the description of the window frame.
MS calls this "Option Group".
Revit needs this.
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