With no context, I don't know of a verb that distinguishes making a list of items with alphabetical labels from a list with numerical labels. The action is creating the list, so most verbs are distinguishing the method of listing not of labeling. How you label the list has so many possibilities that we typically use an adjective to describe the type of list we've created. For example, there are bullet lists, numbered lists, etc.
Some style guides might have names for different types of labeled lists. I'd have to do some research to find out and if you must have a verb, it wouldn't be useful to you.