Deleting Records from a Library
You can delete one record or multiple records from a library. The easiest way to delete multiple records is in table view.
To delete one record from a library:
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Select the record, then choose Records > Delete Record (or press Command-Delete).
 
To delete multiple records at one time:
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In table view, Command-click or Shift-click the records you want to delete, then choose Records > Delete Selected Records (or press Command-Delete).
Note  When you press Command-Delete, the records are permanently deleted from both the library and any collection or related data fields that displayed them.