Looking to put a quick series of dropdown lists that are dependent on the selections made. What is the easiest and most efficient way to do this in LiveCycle Designer? Thanks

what is the easiest and most efficient way to relate multiple dropdown lists that are dependent on the choices being made.   When using Adobe LiveCycle Designer - is there something specific that needs to be done for this to occur (i.e. data relationship building, etc)?  thank you and appreciate your assistance.