I have this existing code that I'd like to modify for another cell:

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I have two questions:
  1. If E14=N6 and if F15=N8 then add data validation X13-DI13 to G17. What to modify in the code above?
  2. If I want to add this code in the hidden sub worksheet, can I just paste it underneath the existing code (here shown above)?

Thank you for your help!