The right-wing extremist said the term "commander", which he uses for himself, refers to "a person who has authority and loose ties with two other cells."
"I am a self-run and independent cell, and I am connected to two others," he told the Oslo District Court, adding that each of the other cells consisted of one person.
Breivik has said he is a member of the Knights Templar organization, which the prosecution on Monday said it did not believe existed.
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On Tuesday, the confessed killer insisted that everything he had said about the group was true, but that he may have embellished his description a little, stressing the group was made up of a few individuals around Europe.