Sum variables from operations

[Barbara1]

Hi Makers! This seems simple in my head, but doesn’t seem to be in practice! I am trying to take a number of variables (same variable; different operations) and add them together.

Here’s my test case:

The first module finds transactions (date/time) that meet criterion - they represent start times. The second module finds transactions (also date/time) that are the end times for each of the transactions found by module 1. Finally, the variable at the end subtracts datetime of module 1 from datetime of module 2 to get the duration for each set. Basically, I need a way to get the sum of the durations from all six of the results.

Thoughts? Thank you for taking a look and providing me with your expert views!!!

[momomomonmon]

@Barbara1
Why not keep the results of each subtraction in the Data Store - if the number of records retrieved from MySQL changes dynamically, there would be no way to keep the calculation results within Scenario.
When saving to the Data Store, if we store the execution ID of the Scenario in the Data Store record, we should be able to retrieve only the numbers we want to add up at the end.