How to save multiple data on Web

so for example i have 3 buttons which they have all the same script in it with variables of level,count,cost. how do i save their data individually using player prefs? so that i have for example(button1 > level = 1,count =2,cost = 3, button2 >level = 5,count = 10, cost = 9, button3 > level = 10, count = 3, cost = 100).