For debugging purpose:
To drive TestCase into certain point of flow:
Put ExitRun() before the line you need to stop.
Do\correct\add whatever you need in the script,
put cursor at next line and:
RunFromStep (Menu --> Run) to continue running this script.
You can put a breakpoint in case you want to pause the script...but QTP does not allow you to change and run script at run-time. So in case you are planning that u will pause and change the code and then continue running the script then thats not possible...