ok stupid problem. I have two cases and each have matching angles etc, I need to widen both parts to move the left and right geometry out a bit.
I started by opening it up as its basic sketch - putting two vertical lines top to bottom and cut out the line in the middle. logic being to then dimension the sides accordingly and put a line back in after.
I can make some photos up as i understand that prob does make any sense?!
Many thanks in advance,