Thanks for joining in, @Birmingham Bookkeeper.

To clarify, QuickBooks Online US version can only create and send multiple invoices in QuickBooks Online Advanced. 

For the UK version, the quickest and the best option is to import them at once.

Here's how:

1. Go to Settings menu and then select Import data.
2. Select Invoices, then select Browse and then find and select the spreadsheet of your invoices. 
3. Select Next.

After that, make sure to map your spreadsheet’s column headings to match with QuickBooks fields. 

Here's how:

1. Map the column headers with invoice fields in QuickBooks. Fields with an asterisk (*) are required.
2. Select Not applicable for any fields not in your spreadsheet. If product or service isn’t added, QuickBooks populates with a generic item called "sales".
3. Select the date format you used, like DD/MM/YYYY. Note: While importing the invoices, ensure that the invoice dates are in present and past. The invoices with the future dates will not be imported.
4. Select Exclusive or Inclusive as your tax option. To see this option, set up VAT in QuickBooks.
5. Click Next.

Then, map your tax codes:

1. Match your VAT codes to those setup in QuickBooks.
2. Select Next.

For further insights, follow the steps shared in this article: Import multiple invoices at once.

Get back to us if you have more concerns. We'll be around to guide you.