- WorldShare Reports
This portion of the reports options is looking at the type of data (e.g., Bibliographic Records) on which an action was taken. You are asking about those specific actions.
The action "Initial holdings set in WorldCat" is describing all of the existing records that have had your symbol added to them for the first time.
The action "Add WorldCat record" is describing all of the records that were added into WorldCat by your institution.