Multiple images in a texture 2D

I am trying to create a game where there is a player which has to change poses according to the input. I also have all the images of all the poses. But I don't know how to keep many images in a texture 2d. I want something like this.


There will be a few players(texture 2d) and their poses(images inside texture 2d). dragging them onto each other doesn't work, neither does multiple layer tif images.

 

you have to do it in photoshop