I want to understand how I should go about charging my customers shipping on ZOHO invoices.

I believe that I need to create a line item to do this as the standard shipping field seems not to be included in any GST calculation. My challenge is related to how exactly to "enter" this charge/s in Zoho.

Shipping model is VERY simple for the customer. Either spend under 100 amount and get charged flat shipping of 10 OR spend over 100 amount and get shipping zero rated.

The real maths (behind the scenes as follow)

Charge to Customer                        Expense to me

10 + GST                                         50 + GST (lighter items)

Charge to Customer                        Expense to me

0                                                      50 + GST   

0                                                      85 + GST

0                                                      100 + GST

0                                                      110 + GST

Do I need to create line items for EACH and EVERY charge/expense combination which is VERY tedious? Or is there a smarter way to do this?

Thanks!