Backoffice Catalogue Discount

[KaraCooma]

Hello,

I was wondering if there's a way to implement this purchase through the backoffice.

We currently have a product where if the customer has bought that software once, each additional software will be discounted to a specified price.

For example

Software for first purchase cost $270
Each additional purchase of the software is $100

I think the version of my prestashop is 1.3.5.

Thanks!

-Anthony