How to validate data in already list dropdown validated.

R

Rao Ratan Singh

I m in trouble that in my worksheet range d15:d24 is validated by List
dropdown. But i want to validate that in above mentioned range that product
name of my company should not repeat again.

What should i do to validate double or any other idea for it.

Help me

Thanks in advance

Rao Ratan Singh
 
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