When setting up a new account that has numerous locations, you can either decide to create a new account (Manage Accounts>Add User) for each location, or just create multiple locations for the same account (Manage Locations>Add Location>Select desired account under "For Who">Add Location info).
Adding a new account for each individual location would only be necessary if one person from each location is going to handle their dashboard independently.
Otherwise, if there's just one person or a core group of people that will be handling the dashboard for all the locations, it's better to just add all the locations to the same account through the "Manage Locations" tab.
Note: If you add multiple locations to the same account, there will only be one admin Username and Password.
Numerous people can be logged into the admin dashboard at the same time.