What is Milton Waddams' profession?

According to the Wikipedia page:

Peter Gibbons, a programmer at a company called Initech, is frustrated and unmotivated at his job. His co-workers include Samir Nagheenanajar and Michael Bolton, also programmers, and Milton Waddams, a meek collator who is mostly ignored by the rest of the office.

So Milton is a Collator, which is:

Collation is the assembly of written information into a standard order. Many systems of collation are based on numerical order or alphabetical order, or extensions and combinations thereof. Collation is a fundamental element of most office filing systems, library catalogs, and reference books.

Collation differs from classification in that classification is concerned with arranging information into logical categories, while collation is concerned with the ordering of items of information, usually based on the form of their identifiers. Formally speaking, a collation method typically defines a total order on a set of possible identifiers, called sort keys, which consequently produces a total preorder on the set of items of information (items with the same identifier are not placed in any defined order).

Or

collect and combine (texts, information, or sets of figures) in proper order.