Asset Store Upgrade System is stackable?

I am planning to publish some modular asset packs and I was undering if there is a way to make the discounts from the upgrade system stackable.

For example lets say I make a modular fantasy kingdom pack asset and it costs $99

But the asset is very large and not everyone would be interested on buying all it contains so I make multiple lite versions.

- Modular elf village $25
- Modular peacefull hamlet $20
- Modular medieval city $50
- Modular medieval fantasy buildings $40

I know I could set a discount price for people who bought a lite version to get the full kingdom pack using this system.


But is there a way to make the discount stacks so that if people purchased 2 or more packs they can get the full pack with a bigger discount?