I Have a rental business. I need additional columns/multipliers for the invoices as follows:

1) Hire rate (a)
2) Quantity (b)
3) Time (weeks/days hired) (c)
4) Hire total (abc)
5) GST on total for item 4
6) Security deposit amount per item (e)
7) total security deposit for the quantity of items (e*b)

Then I need a subtotal for no 4 , 5 and 7
Then I also need an overall total

Currently You cannot add columns to the invoice templates, so I cannot currently use quickbooks for my invoicing.

I have attached a screenshot of the invoice template in excel that I currently use.