I have all the steps to help you set up different invoice templates in QuickBooks Online (QBO), Annette.

QBO offers a Custom form style feature, enabling you to edit or create your template according to your preferences and use it in your sales forms. Here's how you do it:

1. Open your QuickBooks account and go to the Gear icon.
2. Select Custom form styles.
3. Click the New style button and choose a sales form (Invoice).

Then, we can customise the appearance of your template according to your preference.

1. From the Design tab, choose a different template style if you want it to be in a different format for specific customers.
   
   
   
   
2. Enter the Business name and other details like the ABN from the Content tab.
   
   
   
   
3. Customize the appearance of your invoice in emails.
4. Once everything's fine, click Done to save your template.

You can repeat these steps if you want to create another one with a different template or style for your invoices. After that, when you create a new invoice, click the Customise button to select the template you want for that invoice.

For more information about personalising your templates, check out this article: Customise invoices, quotes, and sales receipts in QuickBooks Online.

You can also create recurring transaction templates to automate regular financial tasks, saving time and reducing errors.

Moreover, visit this article to learn how to automatically or manually send reminders to customers when your invoices are soon to be overdue: Set up automatic reminders.

I'm willing to help you out if you have more questions about managing your invoices or other QuickBooks concerns, Annette. Just leave a reply below and I'll provide the necessary help.