I'm gonna open a can of worms here but I get a little erked when I see Upper, lower , inner outter chest.
There are only two chest muscles:
Pectoralis Major, which has two heads, the Clavicular Head which is sometimes reffered to as the Upper chest and the Sternal Head which is sometimes reffered to as the Lower chest
and the Pectoralis Minor which runs along the side of the pec major up to the shoulder.
That being said, all you can do is build the muscle, shape or the gape in the middle is deturmined by size and genetics.