You can use multiple numbers to segment across languages, regions or topics as you desire. Please see your contract for the terms.
For each WhatsApp Business Account, you can register up to 5 phone numbers. Each phone number is presented as a separate channel to a consumer and can have its own profile information. More than 5 numbers requires segmenting over multiple WhatsApp Business Accounts.
If you require multiple phone numbers, especially when you require more than 5, please make this known to your account manager.