If your entire drive was restored from Time Machine, your business should show on the Businesses page and open as normal. If it doesn’t, your drive was not fully restored, because the Manager application after restoration will look in the same place as it did before the failure.
Manager data files are hidden. To make them visible, in Finder, hit Command + Shift + . (period). Or, look on your Manager Preferences page and copy that data path to the application data folder. Paste it into the search field in the Go to Folder… command under Go in the Finder.
You can restore the business from a backup. (Hopefully you make them regularly and keep them somewhere besides your main drive.) Or you can restore it from the application data folder itself. But you need to know which hexadecimal string is your business. To determine that, double-click to open them directly. After you determine which is which, you will have to close them all. Then open Manager normally and restore the business. Read more information in these Guides: