Hi catherine31,
The option to customise transactions forms is currently available on invoices, sales receipts and quotes. On the other hand, you may try to customise the Standard template and untick GST and Amount column. Here's how:
- Go to Gear icon and select Custom form styles.
- Select Edit on the Standard template.
- Select Content.
- Select the pencil icon on the second part of the invoice.
- Untick Tax and Amount option.
- Select Done.
- Open the Purchase order created and select Print.
Let me know if that works well on your end. Have a nice day.