Yes, you can upgrade from Simple start to Essentials, willem1.
Adding custom fields on invoices is available in QuickBooks Online Essentials, Plus, and Advanced versions. I recommend upgrading your plan if you want to take advantage of this feature. I'll show you how.
- Sign to QuickBooks Online as primary or company admin.
- Go to Settings ⚙, then Account and settings.
- Select the Billing & Subscription tab.
- Ensure your payment info is current.
- In the QuickBooks Online section, click Upgrade your plan.
- Review the available plans and then select Choose plan.
- Follow the on-screen steps to upgrade your plan.
Once done, you can follow the steps outlined by my colleague above to add or create a custom field on your invoice.
Financial reports provide you with insights into several aspects of your company. The majority of reports are available for all QuickBooks Online users. I've added this article for more details: Reports included in your QuickBooks Online subscription.
Feel free to post again if you have further questions about the custom field. We're always here to help you.
