Click on the 3 dots in the upper right hand corner of one item
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Click "Add to workspace". Repeat for the other item.
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Click on the menu in the upper left hand corner
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Click Tools -> "Workspace"
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Select all records you want to merge
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After all records are selected, Click "Join"
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Click "OK"
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You'll receive confirmation that the records were merged and will only see one record in your workspace. You may 'clear the workspace' when you are done.