I order items from a vendor through a purchase order, and then I resell it to my client. How do I take my vendor purchase order and copy it into an invoice?

Thank you for sharing this with us, sbcollora. I can see you want to copy the purchase order to your client's invoice in QuickBooks Online.

To copy the purchase order directly to the invoice isn't supported by QuickBooks Online. Instead, we need to take note of the details so you can add the PO information to the invoice.

Once the items are received, you need to create products and services so you can add them to the invoice to bill your client.

Here's how:

1. Go to the Sales menu and select Invoices.
2. Click the New button to create a new invoice.
3. In the invoice, choose your client from the Customer dropdown
4. Input the date, items, and description. 
5. Press the Save and Close button once done.

This allows you to efficiently create the invoice based on the purchase order, ensuring the details match. Any discrepancies between the purchase order and invoice would need to be manually adjusted.

Furthermore, To initiate a refund for dissatisfied customers or overpayments, refer to the article provided and scroll down to the section outlining the steps required: Record a customer refund in QuickBooks Online.

Thank you for choosing QuickBooks Online, and we look forward to serving you more in the future. I'm glad to have you today.