an example can be found on AMOSPro_Examples:Examples/H-2/Help_28.AMOS
Deletes one or more sprite images completely from the object bank.
Del Sprite n
n is the number of the image you wish to remove from the bank.
If you want to erase several objects, you can use the second form of this instruction.
Del Sprite f To l
The command will now delete all the images from f to l.