Click on the Worklist tab.
Select two or more studies using the checkbox on the left of each study row.
Click the Merge button 
at the top of the worklist.
Identify the primary study.
Click Merge to complete.
Click on the Worklist tab.
Select two or more studies using the checkbox on the left of each study row.
Click the Merge button at the top of the worklist.
Identify the primary study.
Click Merge to complete.
To merge two or more studies into a single study, begin on the Worklist page. Select all studies to merge into one by checking the box for each entry, and click on the merge button, , listed with the batch operations at the top of the worklist. The merge page appears, listing the selected studies. Choose the study to use as the primary study. The primary study data will not change. Click the Save button to complete the merge. The system modifies the study information of each studies to that of the primary study.
If multiple reports exist for the studies, the primary study becomes the main report and the others are added as addenda. If you want to keep the primary study report and purge the rest, clear the mark in the Keep all reports checkbox.
When a study is archived and removed from the worklist, it is treated as a retrieved study when it returns to the worklist, and cannot be merged with another study. If you attempt to merge a study and it fails, check to see if it was retrieved from an archive.