You can create a brand report from a list of accounts, as long as the accounts in that list have Reputation Management activated.
If your list does not have active Reputation Management on its accounts, then those locations will not be added to the brand report.
First, select the 'kebab' menu for your list of accounts, and choose 'Create Brand'.
Next, choose your brand's title and structure.
Once the brand creation is complete, you can navigate to it directly via the 'kebab' menu.