Can I insert a client's order number on his invoice

Hi @useralex,

I'll answer this query for you about bills in QuickBooks Online (QBO).

The option to include custom fields in expense transactions is unavailable in QBO. What you can do is utilize the Memo field of expense transactions in this situation.

If you want to customize your sales forms, look at this article: Import custom form styles for invoices or estimates. It's a detailed guide on how you can create a custom template then import it to QBO. You can then use that same template on your sales transactions. 

Have other questions about customization in QBO? Place it in the comments below, and I'll handle it.