Kim
Another tip.
I was given to understand that I need to copy all my PRODUCT IMAGES to each domain. That is not necessary - if you specify the image source as the full url to your main site you only need to maintain one set of images.
That is a major benefit where there are hundreds or thousands of products; it also saves the tedium of making copies of images for each domain and uploading each.
Of course, by having images on each domain you can vary images if that is a benefit.
And, if your main site goes down all other sites lose their images.
For me, with five sites, I will use the url eg:
http://www.malikstores.co.uk/IMAGES/small/W/WAHL08PencilStraightener.jpg
Beware that the path is case sensitive
As I work with multi sites I find so much flexibility!
One example, you can have a different payment system for each domain. May seem unnecessary but there are situation where this may be useful.
I am realising that there could be value in a forum on multi sites!
In the meantime I hope someone can come to your assistance but I fear that there are not yet many of us going this route.
Chris