Randomizing levels already occurs automatically with the CBC designer. Usually, people have difficulty UNrandomizing them. To UNrandomize them, go to the Design tab and look for "Concept Sorting". (If you're on v9, later versions have moved this under the "Additional Settings" button.) You can UNrandomize them by natural level order (would always show Brand A, then Brand B, then Brand C, for instance), or by randomized level order, where respondent 1 might always see Brand C, then Brand A, then Brand B, while respondent 2 always saw Brand B, then Brand C, then Brand A.
Occasionally, users will want to import a design and have the software randomize it for them. Unfortunately, there is not a setting in the software to randomize the concept order, so you will have to do this prior to importing the design.