If you want to separate the parts, use the tool to the left of the select tool, click and drag ONLY over that one part, press control+c, create a new costume, remove the weird outline repeats and other things until it's just the thing you want, create ANOTHER costume for the whole pose, and then copy and paste THAT part into the new costume. I made this using an app called "Inkscape" to make an SVG of an old thing I used to see on youtube I used the "bitmap trace" tool, so I didn't want to make you suffer, a robot did.
Kphoria on DeviantArt (DO NOT LOOK INTO IT, I REPEAT, DO NOT LOOK INTO IT) Update: I made it as big as I can so I can bit map it Update 2: I made my own spritesheet