In situations where you have customers with multiple properties (landlord/tenant, property management, etc.), you will want to add a location or more under the parent account so you can manage services, payments, invoices etc. all under one account.
Here is how you add multiple locations to a parent account.
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There are indicators in the system showing you when you are looking at an account that has multiple locations.
This first one is when you are looking at the parent account and it is showing that it has sub locations.
This screen shot is showing that you are looking at the child account.
From the customer list under customers->view all, you can tell which customers have child locations from this icon.
From the Financial->Unpaid Jobs page, you will be able to see information on the Child and Parent account (serviced and parent account).