Migration from Business App to Business API
Migration from the WhatsApp App or Business App => WhatsApp Business Platform
3 different types of Account
Before registering a number for the WhatsApp Business Platform any existing WhatsApp Account consumer app or small business app) must be completely deleted. The process to fully delete a WhatsApp account can be found here:
Chats cannot be imported from the WhatsApp App to the WhatsApp Business Platform.
There is currently no option to import previous conversations.