On Shabbat, we're supposed to begin the meals with two whole loaves - "Lechem Mishneh." According to Shmirat Shabbat KeHilchato as quoted in the article linked above, "If two loaves bake together in an oven and become attached, they may be broken apart and still count as two loaves."
I rely on this ruling routinely when using bakery-made challah rolls. They tend to come in groups of six, arrayed like a six-pack of soda, and attached due to baking next to each other. We separate them and use them as loaves.
Given this ruling, what is the status of the individual balls in a pull-apart challah? Can they be broken out and each serve as their own loaf? If one is broken off, can what's left be used as a loaf?