If you have another Google Apps account under a different domain, then you may have migrated email from one Google Apps account to another. However, Google Docs poses another issue altogether.
To move docs into a new instance of Google Apps, you have to do the following:
- Select all the documents you want to transfer, go to the More Actions drop down from your old account you want to transfer from and click on Export. This will compress all the documents into a zip file and download it to your hard drive.
- Afterward, you can go to your new Google Drive and hit the Upload button in the top left corner, and choose all the documents you just downloaded. It will take a while depending on the size of your Google Drive.
Note that any documents for which you are a collaborator but not the owner will not transfer correctly with either of these methods; you’ll need to contact the owner of those documents and tell them to re-share them with your new account.