I'm trying to set up a clothing shop but can't find how to change the item attributes.
all I have is box size

obviously each item will require size and color. Noting that some manufacturers size items as s/m/l and some in sizes 8,9,10 etc
Also, is it possible to link some items with other. For instance a top and bottom outfit but the top and the bottom are sold separate but I would like to provide a link on each item to the corresponding other.
Thanks