How to create transactions in JMeter

To create transactions in JMeter we do have a separate assertion called Transaction Controller

The Transaction Controller generates an additional sample which measures the overall time taken to perform the nested test elements.

Attribute	Description
Generate Parent Sample	If checked, then the sample is generated as a parent of the other samples in View Results in Table, else it is generated as an independent sample in View Results in Table.
Include duration of timer and pre-post processors in generated sample	Whether to include timer, pre- and post-processing delays in the generated sample. Default is false

Make sure that all the required elements under a transaction must be moved to a specific Transaction Controller to get the exact response times.