815 ILCS 115/3

In any suit mentioned in the preceding section a separate judgment may be entered by default against any defendant or defendants severally liable who have been duly served with summons, and against whom the plaintiff would have been entitled to judgment had the suit been against such defendant or defendants only. The suit shall thereby be severed, and shall proceed to trial against the other party or parties in the same manner as if it had been commenced against such other party or parties only, and if the plaintiff recover, judgment shall be entered against such one or more of the defendants as are found liable to him, but in no event shall the plaintiff be entitled to more than one satisfaction.