Please someone teach me how to make a simple multi-level list like this

[Clippy]

Please someone teach me how to make a simple multi-level list like this

[Clippy]

This is not a simple multilevel list. I suggest you first start reading up on how to creat multilevel lists. There's plenty of how-tos to find.

Secondly i would then reconsider the (a) (i) and instead have the (a) being level 1 and (i) level 2 because that's more standard (hence simpler).