I am trying to make a simple set of nested lists, but intentionally trying to reduce visual clutter to the code by limiting bracket use and environments. I want to create something like this:

Argument {IIa} {Main argument}
Logic {Main argument contains …}

Argument {IIIa} {Subargument}
Logic {blah blah blah}

Argument {IIIIa} {Subargument}
Logic {blah blah blah}

Argument {IIIIb} {Subargument}
Logic {blah blah blah}

Argument {IIIIc} {Subargument}
Logic {blah blah blah}

Argument {IIIb} {Subargument}
Logic {blah blah blah}

… where the custom command Argument has as it’s first parameter a nesting level, which is used to guide the rest of the input into a nested series of enumerates, like so:

• IIa. Main argument
  Main argument contains …
  • IIIa. Subargument
    blah blah blah
    • IIIIa. Subargument
      blah blah blah
    • IIIIb. Subargument
      blah blah blah
    • IIIIc. Subargument
      blah blah blah
  • IIIb. Subargument
    blah blah blah

I have tried several approaches, but none that do away with the need for an explicit scope for the nesting levels. How can I create the nesting by definition, via the first argument in the Argument function?