How can I edit the PO number assigned by quickbooks?

Welcome to the Community, kandip.

Changing the purchase order (PO) number is simple. I'll guide you through it. First, you'll need to enable Custom transaction numbers to let you choose the PO number you want.

Here's how:

1. Click on the Settings icon and select Account and settings.
2. Choose the Sales tab.
3. In the Sales form content section, select the edit ✎ icon.
4. Toggle the box that says Custom transaction numbers.
5. Select Save and then Done.

You can find more details in the following link: Create and send purchase orders in QuickBooks Online.

Also, here's an article that guides you on adding purchase orders to expenses or bills: Record a bill or expense after your vendor accepts the purchase order.

Let me know if you need further assistance with managing purchase orders in QuickBooks. I'm always here to help.