Hi I have updated to lastest merchant center and it all seems to run fine, except I am a bit mythed about something I sell bikes and there are various sizes that each have a different EAN number. On each bike i have an attribute for each size, how do i allocate a EAn number to each size? So for example :

Bike 1 :

size attribute Ean Number

Small : 32523523
Medium : 414124124
Large : 2414141
Xl : 4154151

I downnloaded numinixs product fields and I see I can add one EAn number to a product but this doesnt really help? Is there a way I can make an attribute that does each EAN Number. Thanks in advance for suggestions.