1) On the default Sequence (say sequence01 ) Add the clips to different video layers (up to four)
2) Make a new Sequence (say sequence 02)
3) Double click sequence 02
4) Drag and drop sequence 01 into sequence 02 (to a video layer)
5) Right click that video layer bar and enable multi-camera
6) Click window>multi-camera
You will see all the cameras, ready to edit..
*Easiest step by step explanation how to work with multi-camera monitor @ premiere