Hi all,
I wonder if there is a way to add a project parameter to a certain family instead of whole category (e.g. Generic model)
Please take a look at these help topics:

I think you're looking to use shared parameters? Mentioned in the link above also, but a bit more the direction you're looking for maybe. Is it for scheduling?
Still unclear what you're trying to do, perhaps if you elaborate some more. But I suppose if on a Dynamo forum it is said to be impossible, then I guess it most likely is...
the point of a Project Parameter is to apply the parameter to the whole projector based on Category. why not just make a Generic Model with a Shared Parameter in it instead of a Project Parameter, like @martijn_pater suggests?
Howard Munsell
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Using Shared parameter is an Idea, but for dyanamo coding it was not working.
Nevermind
I'm not that advanced with Dynamo, but I think you could perhaps use Element.SetParameterByName node to set some shared parameter value(s)...
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