To copy a Campaign to another account, click the dropdown arrow on the right hand side of the campaign and click 'Copy to'. You can also copy a campaign to the same account.
This will open the ‘Copy Campaign To Another User’ window. In the ‘Copy Campaign To Another User’ window you have the option to name the Campaign and to select the User’s account for the Campaign to be copied to.
Once a ‘Campaign title’ and ‘User to copy to’ have been chosen, click the ‘Copy’ button to complete the copy.