The Bulk Add feature allows you to select multiple titles and add them to your collection in a single transaction.
When the Bulk Add button is clicked:
You can select the each title that you want to add to your collection.
Clicking the checkbox on the Bulk Add Toolbar will automatically select all titles displayed.
Once you have finished selecting the titles to add, click the Add to Collection button. This will begin adding the selected titles to your collection and display a progress indicator in the Bulk Add Toolbar.