How do I set up a petty cash account ?

Usually, set it up as a cash (bank) account.

Hi there, bruce6!

Petty Cash is the company's current assets used to make immediate payments for goods and services.

Just like BRC's response, setting it up is like adding a new bank account in your Chart of Accounts. Let me take you there:

1. Go to Accounting.
2. From the Chart of Accounts page, click on New. 
3. Select Bank from the Account Type drop-down.
4. Select Cash on hand from the Detail Type.
5. Enter Petty Cash in the Name field.
6. Enter the description and click on Save and Close.

This reference will also help you understand the cash flow of your Petty Cash account: Set up petty cash.

We'll keep an eye of your post if you've got more setting up questions or anything else. Have a great day!