Hi I want too add my customers ABN number too an invoice im about too send an i cant seem to find how to insert it in the customer info

Good day, galteecivil.

It's nice to see you here! Let me show you how to add the customer's ABN to the invoice. Please follow these steps:

1. Go to the Sales or Invoicing tab and then click Customers.
2. Select the customer’s name and click Edit.
3. Enter the ABN in the Tax reg. no. field under the Tax info tab.
4. Click Save.

Once done, let's customise the invoice to appear there.

1. From the Gear icon, select Custom Form Styles.
2. Find the invoice template you use and click Edit.
3. Click the Content tab, then select the top box of the preview page.
4. Scroll down and tick the box beside Customer ABN under the Display section.
5. Click Save.

I've added this link for your reference: Customise invoices, quotes, and sales receipts in QuickBooks Online.

Post again in the QuickBooks Community if you need more help. Stay safe!