In addition to tracking your data at the business level, you can also track it at the client-level.
There are two main ways to add a new client:
From the Settings menu
On the mobile app, tap the 3 dots in the top left corner and on the web app, click the gear icon in the top right corner
Tap plus sign in top right corner
While entering/tagging an expense
Tag the expense as business and choose the appropriate business
Tap the Client field and tap the plus sign in the top right on the mobile app or click the Client field, click +Add New Client, type the client name, and hit enter on your keyboard on the web app