Add IBM Native Send Receive queue
Define Put Queue and Enter request under "Request Editor" section in IBM MQ PUT
Define GET Queue
But how can I customize the Get Queue so that it can browse the particular transaction from the queue and then fetch corresponding response?
In MQ, this is usually done with correlation schemes. If you've matched your correlation scheme with what the "real" provider does, your GET should get only the response to that PUT, because it's looking for the same ID.
If your MQ is in JMS mode, there is an additional facility called JMS Message Selector, which allows a GET to inspect a JMS header property for a value, and only consume the message if it matches. JMS Message Selectors are configured in your config assets in DevTest.