Thanks Helperbee

Indeed it wasn't obvious to me that the link needed to be selected then he blue link button on the left of it clicked would insert the actual correct link - so that part is solved. Much easier than finding the actual path to a page or category when using SEO.
However in practice on shopfront the the link is not sticking, it is still using the original path to the empty category.
I have tried clearing system and browser cache several times to no avail.
I see in theory what should be happening here but fear I am missing something simple again....
Being new to AbanteCart Cart I am hoping to push on and contain everything within AbanteCart Cart to see how it works out before committing to separate content as for most things so far I very much like AbanteCart Cart. It would be the way to a consistent looking site but you may be right about focus Helperbee