Hi Narelle7,
If you have turned on GST in your QBO file and would like to invoice without GST, you can select the GST code of "Out of Scope". You can also set that as the default GST code for your QBO file. Here is how:
How to I set up a default tax rate for transactions (Inclusive / Exclusive of GST)? [Video]
- https://quickbooks.intuit.com/learn-support/en-au/gst-and-bas/how-to-i-set-up-a-default-tax-rate-for...
Please let me know if you have any questions.