This tool will delete selected images from a Subject gallery, but leave the keyframe and thus, empty gallery. It is located in the Inspector toolbar.
Use the Delete Photo Series to quickly delete all photos and keyframe.
Here's how to delete selected photos:
Select the photos you'd like to delete by checking the box underneath it and then click the scissors icon to remove the selected photos.
TIP: Select the first image and shift + click on the last to select a range.
2. Confirm the deletion.
3. You're done!