Hello Balakrishna,
If you created the process by template provided by Blue Prism, then you can able to stop by checking ""IsStopRequested()"" value. This scenario is by default provided in process example.
or
you can create a session variable of Boolean and set false by default and set the variable value in control room to true.You need keep decision making for session variable value once after the ""reset global data"" action or you can say after one queue item complete and before picking up next value from queue.
Please find an attached screenshot that.
Thanks & Regards,
Vijay Rudrappa Dodamani