Select an operation from the Operation pull-down menu (append, prepend, replace), then enter the text for that note that you want to add to the selected devices. Text is entered in the Notes dialog as a string. The append and prepend functions add new text to either the beginning or the end of the existing string of text.
Note: The Bulk Field Change deliberately doesn't make any changes to the text you enter, but rather stores exactly what you specify. We have designed it this way so that you have the flexibility to make your own changes, such as including a line break.