How to add images to the drawing substitution window

Hi, I am new to ToonBoom Animate Pro. I want to change some images on an object I am moving to the right using the drawing substitution method however in the drawing substitution window I only see one frame containing all of the layers combined as opposed to seeing each individual limb of my character, I suppose this is because each image is on its own layer as opposed to being on one layer. Any tips on how I can add images to the substitution window will be greatly appreciated.

Thanks,

Rick

the drawing sub window only shows the drawings on that layer. There is no other way to use this i know of.

Ok, thanks for your response I ended up doing some other tedious method.