Hi Justin,
Welcome to this forum.
May I ask you some questions?
Would it be possible for you to have only one sheet to track production time? You would need more columns to detail every entry but then you'll be able to use pivot table to work out your summary sheet for you.
If you stick with your actual plan, one thing you could do is to make your INDEX named range a dynamic one and to add new sheet's name at the end of Index when someone hit the generate new sheet button. This will keep your old formula working forever.
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