Invoke SubworkFlow from main workflow in State machine WorkFlow.

MY PURPOSE IS TO START SUB STATE MACHINE WORKFLOW FROM PARENT STATE
MACHINE WORKFLOW, PROVIDED CONDITION THAT PARENT STATE MACHINE
WORKFLOW SHOULD BE HANG TO THE STATE FROM WHERE SUB WORK FLOW IS
EMERGED, UNTIL AND UNLESS ALL SUB WORK FLOW IS GETTING COMPLETED.

I HAD INVOKE SUB STATE MACHINE WORKFLOW FROM PARENT STATE MACHINE
WORKFLOW WITH THE HELP OF INVOKEWORKFLOW ACTIVITY AND REPLICATOR
ACTIVITY.BUT ....HOW TO HANG TO THE STATE FROM WHERE SUB WORK FLOW IS
EMERGED, UNTIL AND UNLESS ALL SUB WORK FLOW IS GETTING COMPLETED? THAT
I AM STILL NOT GETTING.

DO HURRY IF ANYBODY HAS IDEA.

ANY HELP IS APPRECIATED,,,,