Hi Ramesh
You have a better chance to get an answer for DIS questions if posting in forum "SAS Enterprise Data Management & Integration"
What you're after is "scheduling". With SAS DIS you also get a OEM version of LSF (scheduling software). If LSF is installed and configured at your site then in SMC there is a Schedule Manager plug-in which allows you to define and run flows.
If using LSF is no option then you could write a script which batch submits your deployed jobs - and you then execute the script.
If this is more a "unit testing" scenario then you could also just drag&drop your jobs into a new job and run them in sequence (A,B,C) - the jobs would share the work space though.
If B&C must run in parallel then you would have to create a inner job which calls B&C and the loop transformation in the outer job submits stuff in parallel. I wouldn't recommend doing this for "unit testing" as it feels like too much work to set up - and it's not the right thing to do for a production environment where you should use a scheduler or at least a script.