This document explains how to use data in a shared group step using shared group parameters.
Steps
Click the 'Edit' button on the shared group step.

In the edit screen, create a parameter from 'New parameter'.
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Set the "Parameter name" and optionally a "Default value," then click "Add."

Update the created parameter: select 'Data' as a source and choose the data’s column that you want to use.

Click 'Done'
Within the shared group step, click the 'Edit' button of the step where you want to use the data.

Select 'Shared group parameter' and choose the parameter that you created then click ‘Save’.

Back to the scenario editing screen, click the 'Save' button to save the scenario.