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Hi,
How can i be sure that each item has its GUID number?
Because many times after exporting the model to the navisworks i find items that hasn't a GUID like stairs. so i can't get its quantification.
And my 2nd question is why there is items haven't a GUID?
Hi @Anonymous,
In order to access the native Revit GUIDs there will be some setup. Please take a look at this link: Takeoff objects with properties
Please let me know if this resolves your question, thanks!

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