If multiple requests are trigger from single action and same parameter is passed in those requests, then we can group those requests using KBT.
Example:
Consider a Jmeter script which invokes 3 APIs for each thread which represents a single user action.
To group the requests of each thread, we can add a dummy url param with unique random value.
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Add these urls as KBT is applicare dashboard.
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Run the jmeter script.
Now we can find the transactions with the unique parameter values
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Note: This function will work in the same way for user actions triggered from browser, if same value is passed in all the requests for that action.