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To add multiple locations to an existing Google Business Profile (GBP), follow these steps:

• Log in to your Google My Business account: Go to the Google My Business website and sign in using the credentials associated with your GBP.
• Access your Business Profile: Once logged in, locate and select the existing GBP that you want to add multiple locations to from your dashboard.
• Click on "Info": Within your Business Profile, click on the "Info" tab in the left-hand menu. This is where you can manage the information for your GBP.
• Select "Manage Locations": Scroll down to the "Manage Locations" section, and click on the "Manage locations" button.
• Add new locations: In the "Manage Locations" section, you can add new locations to your existing GBP. Click on the "Add location" button and enter the details of the new location. You'll need to provide the business name, address, phone number, website URL, and other relevant information.
• Verify the new locations: After adding the new locations, Google may require you to verify the business information for each location. This verification process ensures the accuracy and legitimacy of your listings.
• Confirm the changes: Review the changes you made, and once you're satisfied with the information, click the "Apply" or "Save" button to update your existing GBP with the multiple locations.
• Manage your locations: Once added, you can manage each location individually within your Google My Business dashboard. You can update business hours, add photos, respond to reviews, and monitor performance metrics for each location.

Remember to keep all your business information accurate and up-to-date for each location to enhance the user experience and boost your local search visibility.

Note: If you have a chain of businesses with many locations, you may also consider using the Google My Business bulk upload feature to streamline the process of adding multiple locations to your GBP.