Установить прямоугольник текстуры на CCSprite.
//create a sprite, e.g. myFile is 128x128 pixels
CCSprite* mySprite = [CCSprite spriteWithFile:@"myFile.png"];
//position it somewhere
[mySprite setPosition:ccp(xPos,yPos)];
//show only the first 64x64 square
[mySprite setTextureRect:CGRectMake(0, 0, 64, 64)];
//add it to the root
[self addChild:mySprite];