Go to the Lists menu and choose Tax Codes (Australia) or GST Codes (New Zealand).
Click Combine Tax Codes (Australia) or CombineGST Codes (New Zealand).
Select the tax or GST code you want to keep from the Move transaction history to list. This is the code the deleted code’s history moves to.
Select the code to delete from the Delete this tax code (Australia) or Delete this GST code (New Zealand)list.
The next action cannot be undone
Before continuing, check you’ve selected the correct tax or GST code you want to combine. If you combine the wrong tax or GST codes, you’ll have to restore from a backup and re-enter transactions posted using these codes since the backup.
Click Combine Tax Codes (Australia) or CombineGST Codes (New Zealand). A confirmation window appears.