How to properly set up Price Books for selling shoes?

How to properly set up Price Books for selling shoes?

I am trying to use price books to give volume discount.

Scenario 1:
Say I have, a sport shoe. This come in various sizes.
The customer orders 500 pairs of shoes in various sizes. I am tracking various sizes in Zoho CRM. So I have shoe size6, shoe size7... This in Zoho is considered as different products
My volume discount start on 100. On some of these shoe line, say size 5 he only orders 56. So no volume discount.
However, the rule for me is to give volume discount on the 500 not on individual item

Is there a way to automate that in Zoho CRM?

Scenario 2:
I want to give a total volume discount on the total number of pairs of the invoice.
I do not want to give it per type of shoe.
Is this possible in Zoho CRM?


THanks

ALex