Google now allows multiple administrators for Google+ business pages. If you have created a page in the past, here’s how to add others to help manage the page:
1. Go to any page you administer by clicking the down arrow next to your profile picture at upper right on your home page.
2. Click the “Settings” link in the right sidebar of your Page’s profile.
Owners vs. Managers
The person who created the Page is the (only) Owner. Up to 50 managers can be invited. The only power managers don’t have is deleting the page or transferring ownership; only the owner can do that.