How do i reconcile the petty cash if there is no funds transferred for petty cash?? I only have receipts that my boss has spent.

Welcome to QuickBooks Community, Anishah.  

In QuickBooks, you can enter a sales receipt for the sales received and expense transaction for the expenses made using the petty cash. Then, whenever you take money from the petty cash account and deposit it to the business bank, you'll have to record a transfer in QBO. Here's how: 

1. Go to the + New button.
2. Select Transfer.
3. In  the Transfer Funds From field, select the petty cash account.
4. From the Transfer Funds To drop-down list, select the bank account that the money is going to.
5. In the Transfer Amount field, enter the amount being transferred.
6. Edit the Date field.
7. Enter a description of the transfer in the Memo field (optional).
8. Select Save and close to complete the transfer.

To further guide you in putting cash in and out of your petty cash account, I'd recommend checking out this article: Manage petty cash in QuickBooks Online. 

Once done, you can start reconciling your account. This is to monitor your business' income and expenses and determine any possible errors accordingly. You can refer to this article: How to Reconcile Your Petty Cash. 

Let me know if there's anything else you need help with. Know that I'm always here to help you anytime. Take care and keep safe!