I'm looking for an app that will enable me to create multiple discounts variations and offer upsell that isn't usually available at the store, for example:
The final offer should be something like:
Buy this necklace with a pendant of your choice for X$. Add extra Y$ and we'll add a second pendant for the necklace. Add extra Z$ and we'll add a third one.
Is there an app out there that can handle such things?