Preset angles

I was thinking of a way to make preset angles for my robot’s lift I am planning to have somewhat of a “corkscrew” lift. (seen in archimedes screw used for water transportation)

I was going to use this to raise and lower the intake. I wanted to make it so a button went from position A to position B or position B to position C etc.

I was planning to have 3 positions and i use EasyC v4 For programming

Thank you