Yswellin , 
AkiraWong and 
Rory
I know how to make the background transparent in photoshop XD
I meant that you would select a part of the images in photoshop , then copy *ctrl+c* , then open C2 and in the sprite editor , click *ctrl+v* or paste button ! And it would copy the selected part with transparent background ...
but what C2 does is that it transform all the transparent space into white space and I want a technique on how to prevent it !