Thank you for joining in the Community forum, @amar01.
Currently, you can only merge duplicates of the same type in QuickBooks Online. You can merge a customer with another customer, but there isn't a way to merge a customer to a supplier.
Please know that the merging process is permanent and can't be undone at a later point. If you have follow-up questions regarding this process, do let me know. I'm here to help.
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