Change a parameter of the listed element IDs

I have extracted element IDs from Critical Path report and made a list.

Now would like to set a certain custom parameter to 1 for the listed elements (there are various types of families in
the list).

Is there a way to do this ?

hi @GHK151112112
for that your custom parameter needs to be multicategory.
Then here’s how you could do it :

in this case the ids are integers

 import clr
import RevitServices
from RevitServices.Persistence import DocumentManager
import Autodesk
from Autodesk.Revit.DB import *

doc = DocumentManager.Instance.CurrentDBDocument

ids = [ElementId(i) for i in IN[0]]
elements = [doc.GetElement(id) for id in ids]

OUT = elements
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