I have a flow chart which has try catch. In my try there a some more sub flowcharts. I need to handle an error which I am handling in sub flow charts. For eg in one of my sub flowchart if a user exist i want to stop the process , throw an error that user exist and want to catch in the main flow chart.
You will need to use an IF activity for your condition, then place a THROW activity inside the IF. Since this will be a BusinessRuleException, you can use this in your Throw: new BusinessRuleException(messageString)
Then, in your CATCH of the Try/Catch, use an Assign to store the exception to a BusinessRuleException type variable inside the BusinessRuleException type. Then, in your Main flowchart, you can use a Decision or IF with condition businessRuleException isNot Nothing and Log the exception and/or Throw it again if desired.
Please also check out the REFramework under Templates found in Studio. This could give you some good ideas on error handling as well.