Create parameter in family types

Revit
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Hello everyone, good morning.

I’m trying to create a Dynamo routine to add shared parameters to multiple families at once.

In other words, I want to apply a parameter to all families of a certain type at the same time — but I’m not having much success.

Where might I be going wrong?

:backhand_index_pointing_right: Do I really need to create the shared parameter beforehand (in the .txt file), or can I just type the name of the parameter directly?

Also, why doesn’t the “Families” node work properly in this case?

If anyone can help this Dynamo beginner, I’d really appreciate it! :blush:

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Hi @cintiamiranda21 , see if that works,

also this,

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I still don’t understand. Does this solution create parameters in all template families? It didn’t work in any of them, not even when loaded, can you guide me?

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I might be wrong. But i guess you have to open the actual
Famlies apply the changes and close them (and / or reload them in your project).
AFAIK you can’t add any Parameters from within the Project.