Transferring contacts from multiple lists (gmail, exchange, cloud) to iCloud on iPhone 12

"Transferring contacts from multiple lists (gmail, exchange, cloud) to iCloud on iPhone 12: Transfer of contacts from Iphone 12 to Icloud. Contacst are divided in lists, such as gmail list, exchange list and cloud list"

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Transferring Contacts Between Accounts:

"Exporting, then Importing" is what you are trying to perform.  So, Go Here: Import or Export a vCard in Contacts on iCloud.com - Apple Support. You'd export the Contacts a vCard file from one Apple ID, and then Import it to the other Apple ID.

• Gmail: Export, back up, or restore contacts
• Exchange: Import or export contacts in Outlook using a .csv file