On the iPhone app, sellers can select multiple listings in their locker to bump, price drop, or remove. Simply go to your locker and click "Select items":
From here, you can "select all" of the items in your locker, or simply select the individual listings you'd like to update.
Once you've selected the relevant items, you can bump, price drop, or remove them all at once. Please note, you can only bump as many items as you have available bumps. Remember, you can always purchase more bumps from your locker!
You can also set filters in your locker to narrow down the results. For example, if you want to price drop all the football gear in your locker but nothing else, filter your locker to the category "football", select all items, and then set the price drop amount!