With BULK ACTIONS you'll be able to that with just a few clicks:
Head up to the ARTWORKS section and activate the BULK ACTIONS toggle and follow the steps listed below:
1. Enable the toggle
2. Select the Artworks you wish to update its attributes, or use the SELECT ALL option to update all Artwork attributes at once.
3. Open the “Update attributes” drop down menu and select the ones you wish to update:
4. When you're done doing the selection, click on “BULK EDIT”
5. Update the values
NOTE: If you are editing the Collection values, make sure to press the "Enter " key to confirm the value. You can confirm this as the name of the collection will appear in a red square as shown below:
6. Once you’re done making changes, save them by clicking “APPLY TO SELECTION”