Can I enter details in the memo section on invoices?

Yes, you can, @info-corporateco.

No need to populate a memo field in your invoice, all you have to do is to enter a text in the Message on statement section in your invoice. This way, the information entered in it will be visible in the Memo column. I'll show you how.

1. Go to the + New menu in your QuickBooks Online (QBO).
2. Select Invoice.
3. Enter a text in the Message on statement section.

    

4. Fill in the needed details of your invoice and click Save once done.
5. Then go to the Sales menu and click the All Sales tab.

    

Furthermore, you can also add a custom fields in your invoice and name it as "memo". To be guided, you can refer to this article: How to add custom fields to sales forms and purchase orders.

Once you're all set, feel free to utilize this link for guidance on how to personilise and add specific details on your invoice: Customise invoices, estimates, and sales receipts in QuickBooks Online.

I'm all ears if you have other queries about your invoices or other fields in QBO. Take care and have a great day ahead!