Hi there, @shaunhiggs.
Thank you for dropping by here in the Community. We can help you send them using QuickBooks Online.
If you're trying to do it at once, I suggest marking the Send later option on each transaction (see screenshot below).
Once done, you can go to the Invoices tab and email by batch. Here's how:
- On the left panel, go to Sales.
- Go to the Invoices tab.
- Put a checkmark on the invoices you want to send.
- Select the Batch actions drop-down, then press Send transactions/Send invoices.
For additional reference, I've attached some articles you can use as a guide for your invoices:
If you have additional questions or concerns while working in QBO, leave a comment below. I’ll be happy to help you out.