So basically I'm wanting to create a shop menu where players can buy ranks from coins in game.
Quick example:
Rank A: 500 Coins
Rank B: 1000 Coins
Rank C: 1500 Coins
If a player has Rank A already and they want to get Rank C, instead of it costing them 1500 Coins it would cost them 1000 coins.
Is there any way to do that?