Summary
You can create an ad account in a particular Meta Business Manager account, but you cannot transfer it to another Business Manager account.
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You can add ad accounts that you own and get access to ad accounts that other people or businesses own.
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To create a new ad account, you need to create a Facebook Business Manager account
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, grant access to other employees and partners
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, link your business's Facebook Page to your business manager account
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, and add a payment method.
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According to