Help in dynamo script /Automating script


Hello everyone so what iam here trying to do is getting quantities of different elements from my revit model,so the problem now is that i have two different models but the script should be same for both ,for example in one case i have a wall with 11.5cm but in my other model i dont have this wall ,so which node shall i use that if there is no wall of thickness 11.5 cm then it should not print on my excel output file.
looking forward for the guidance.

Im not exactly understand your example, but perhaps you can use the BoolMask node for the pre-selection.

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