How do I define sizes in VM 2.0.4?

[LAMF]

Hi! I am new to VM and I am just in the middle of creating a web shop for horse riding equipment.
I have ran into a strange thing... There is no place to define standard size like S, M, L, XL, XXL etc....
I woulk like to have a selection box with the header Sizes and then possibilities to choose between the standard sizes S, M, L, XL, XXL.
Also if possible how do I define stock status for each size of a T-shirt for example?
Is this really missing in VM or am I just a newbie that don't know how to do it.

Looking forward to some assistance. 

[PRO]

http://forum.virtuemart.net/index.php?topic=100480.0

^^ for stockable

and for non stockable
http://forum.virtuemart.net/index.php?topic=90833.0