Hi lookandbuyme,
No, we do not currently offer a feature that would allow you to delete ALL the messages in one section of the Notifications area within your account. At present, the only way to delete unwanted notifications from your account is to visit the desired Notifications page, check the boxes next to the ones you would like to delete and then click the “Delete Selected Events” button on the page.
The box at the top of each set of events on each page within the Notifications area is a “Select All” option so be sure to use that when appropriate to make sure you don't unnecessarily spend extra time checking the boxes next to each individual message.
-Mike