Hi Wes, thanks for the message, I did manage to edit the dormer, however, it seemed 1 step forward 2 backward. I found the only way to raise the window was to decrease the "bottom height", and play with the "offset from top" while making height larger (which adversely affected the radius of my bat dormer), sometimes the result was different even though the values were the same as previous attempts. I'm a little dumbfounded by this, there doesn't seem to be a metric to it.
Also the roof surface seems to have the largest size of the dormer (from original insert) bitten out of it. which is a nuisance really. Is there a way around this?
Many thanks