Originally Posted by
JamesVan
If you want to drive parameters in nested families, you have to create a parameter in the host family and 'push' it down into the nested one. In the Exit Sign family, you pick the symbol family and drill down to its Type Properties - in this case, looking for the "Suffix" parameter. At the end of that row, you'll see a small button. Click that to assign the nested "Suffix" parameter to an existing or new parameter in the host family. In the file I uploaded, I created a new parameter called "Symbol Suffix" and tied it to the "Suffix" parameter in the nested symbol family.