You're unable to create a petty cash account, Jechalo.
Although, manually added transactions are considered as cash-based transactions. This will help you enter them without linking a bank account. Let's go ahead and create one.
Here's how:
- Go to Transactions.
- Click Add transaction.
- Fill in the necessary fields.
- Click Save.
I'll attach a screenshot for better guidance.
Let me share the article about manually adding transactions in QuickBooks Self-Employed for future reference.
Tag me if you have more questions. I'll address them as soon as I can.