How to Add an Existing Local Business Page to Google My Business
If you've already created a Google+ page for your business but it isn't connected to GMB or your search listing, you can connect them. But first, a warning from Google:
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*Sigh*
Moving on.
1. Sign in as the owner of the Google+ page in order to connect it to GMB. If you don't know who this is, or don't have access, here's some guidance from Google. Once you have access, you can also transfer ownership of a page if needed.
2. Sign in to Google My Business, click "Locations" from the top of the page, and select "Manage this location" for the location you want to connect.
3. Click the hamburger menu (the 3 horizontal dashes) in the upper left corner of the screen.
4. Select "Settings."
5. Scroll to the "Profile" section toward the bottom of the menu.
6. Click "Connect a different page."
7. In the drop-down menu below "Will be linked to this page," choose the Google+ page that you'd like to connect to your Google My Business listing. This option won't be visible unless you're the owner of the Google+ page.
8. Click "Next."
9. Check through the list of changes that will be made to both your Google My Business listing and your Google+ page, and make sure that you're okay with everything.
10. Click "Confirm."
11. Make sure to update the information on the new page. If you disconnected one Google+ page to connect the correct one, some information will be imported from the old page. You can find explanations of what will and won't be imported on this page.
12. If you want to, remove the old Google+ page (a.k.a. "location") by following these instructions.
