How can we configre the Multilevel Discounts with Reduced Discountable Amount at each Level - Max 4 Levels

Hi,

Has anyone configured the Multi level Discounts in Acumatica using Discount Codes?

I was able to achieve the following

1. Item Level Discounts
2. Sub Total 1 - By defining a Discount Code - Type = Group 
3. Sub Total 2 - By defining a Discount Code - Type = Document
4. Sub Total 3 - Not able to By defining a Discount Code - Type = Document / Group as it is taking the same Sub total of level 1 or 2.

How can we achieve this?

Any Idea will help 

Thanks,