It's often easier to update records in bulk than it is to edit each one individually. Bulk editing is as simple as creating a list report filtered to your data set, then selecting records individually or in bulk.
When you select one or more records in the list report with the checkboxes on the left side of your report, the Bulk edit button appears at the top. You can bulk edit any records that you have the permissions to edit.
When you click Bulk edit, you'll get the option to edit data for the currently selected primary record type in the following ways:
Change standard and custom fields
Delete records
Once you've selected the information you'd like to update, click the Apply button to quickly update all of the selected records. You can also click the Delete <record type> button to bulk-delete your selected records.