Image editing in Image Occlusion

I want to be able to use lines to split an image of my flow charts into quadrants to help me better distinctly recall different parts of my charts with the help of my spatial memory.

Image Occlusion recognizes weirdly enough lines as cards. This means, as far as I know, I don’t know of any way that allows me to edit pre-existing image occlusion cards in the editor.

Also, speaking of image occlusion, is there a way that allows for editing all sibling image occlusion cards simultaneously so that the change is applied to all?