Use the execute activity under the qoperation folder. (see attached image)
More info here:
If you generated an XML using the Save as Script option in the CommCell Console, you can use the QOperationExecute activity to run the XML.
Navigate to the Inputs tab of this activity, copy the contents of the XML file, and paste them into the Value column of the inputXML input. We recommend this approach instead of specifying the XML path because you can later export the Workflow to another CommCell without the need to set up the XML file in that CommCell.
I would clone the workflow before you make any changes to the original.
Technical Account Manager - Commvault