If you want to importing Gmail to Gmail it is quite simple through the POP protocol setting, also known as Pot Office Protocol. Just enable it and follow some steps which are:
1. Sign in to your Gmail account.
2. After that, click on the top of the right corner gear button.
3. Select "All Settings
4. Then search and click "Forwarding and pop/IMAP"
5. Finally, wait for the POP Download to complete.
6. Then, in the POP download section,
After that, "message access with POP", you can see several options like
- Keep the Gmail copy in the box.
- Mark your Gmail copy as a read
- Gmail Copy should be deleted.
You can choose any one of the options as per your requirements.
7. Scroll down the page and click on "Save Change."