its actually a pretty easy! of course it's using SPSET, but a trick that i used for that case, is to use SPDEF, because you can define sprite definition numbers! if you want to know more, check out usage #2 for SPDEF.
SPSET (what you want to call it),U,V (U and V are the coordinates of the pixel coordinates for your sprite on the picture),W,H (W and H are the width and height in pixels of the sprite)
SPSET 25,U,V,W,H
