Google Product Forums
Re: How to connect two channels of YouTube with the same account adsense?
Jul 1, 2012 11:25 AM
Posted in group:
Go to the monetization settings tab of your YouTube account, click "How will I be paid?", follow the link to the AdSense setup page, and select the option to use an Existing AdSense account.
Note that you will only be able to do this once YouTube has offered you the option to monetize your videos.