English to Dutch Bus/Financial Retail online shop

I'm working on the translation of the admin part of an online shop. In the bit where the shop administrator can set prices for items, they mention price variants such as quantity discounts and discounts for specific customer levels. Another pricing option they mention is 'extended pricing'.
Here are two example sentences:
1) Specify any extended pricing that you want for this variant.
2) If you want to define extended pricing for each product variant, then set ALL level discounts to 0, disallow coupons, etc...

So far I've arrived at 'flexibele prijzen' but I think there may well be a specific term for this in Dutch. Any suggestions welcome.

Thanks!