Add shared parameters and value to selected elements

Ah I understand it now you want to have a kind of shared parameter added to certain model in place elements without using a shared parameter because you won’t want this parameter be added to the elements

I have not so a solution for you.Maybe look into the Orchid package there are great nodes for adding all kind of parameters
https://forum.dynamobim.com/t/orchid-package-released-at-github/22671

I did something with automatically adding parameters to a family file but you want something for a model in place

https://forum.dynamobim.com/t/adding-multiple-family-types-paramaters-to-multiple-family-files/24749/12