Global changes: Change Text
You can edit references in a global way by using the Change Text command on the Edit menu. This enables you to delete text or replace it with something else across all the references in a library. It can be used, for example, to correct consistent spelling mistakes. It could also be useful for redefining subject terms as you can replace a subject keyword with another one across all the references where it appears in a library. This method allows you to search the text of references for particular words or punctuation in order to identify which records need to be changed.
Global changes: Change and Move Fields
Another way to make global changes is to use the Change and Move Fields command from the Tools menu. As with the above method, this allows you to delete or replace text, but you can also move information from one field to another.
Global changes: Important information
When making any global changes it is vital that only those references you wish to change are displayed within the library window. Select the references you wish to change and then use the 'Hide selected references' or 'Show selected references' options from the References menu to display or hide references as desired.
Failure to do this will result in the changes being applied to your entire library. If in doubt, make a back up of your library before applying any changes.
You can also use the Groups feature to pre-select those references you wish to change