How can I manage more than one business or separate private from business?

There are 2 ways to achive the desired split:

1. You can create separate "Receipts Libraries". Go to the main menu and choose "File" > "Switch Receipts Library". From there you can create a new library or switch between them. You can also double click on those library files and Receipts will open with them.

2. The second option would be to use "Tags" to mark private and business receipts. You can then filter between them.