LevelOne levelOneA = new LevelOne();
levelOneA.baseModel = bmA;
bmA.levelOnes.add(levelOneA);
LevelTwo levelTwo = new LevelTwo();
levelTwo.levelOne = levelOneA;
levelOneA.levelTwos.add(levelTwo);
LevelOne levelOneB = new LevelOne();
levelOneB.baseModel = bmA;