Missing sheets detection

Hi All,
i am fairley new to dynamo and i had a question .

how can i have Dynamo to detect “missing sheets” and then batch creating them?
as an example i have a drawing list in Excel with 50 sheets , while the actual sheets are 45 in the revit file.

Thanks for any help & advice.

Yes, you can use the Categories node to select Sheets and connect that to All Elements of Category. You can import from excel using Data.ImportExcel node. Then, compare both lists using the methods explained here Lookup value in a list and place it in other list - #3 by Robert_Klempau
Hope it helps!