Create Product with different quantity based on different size and width

[Agalya]

Hi,

How to create Product with different quantity based on different size and color of same product.

For Example I have shoes in size 6,6.5,7,7.5,8... and Width M,W, XW, XXW with different quantity.
So when customer see the product, all the size and width of the product should display with availability in the same page and when customer buy shoe in size 7.5- XW, the quantity of size 7.5- XW alone should get reduce.

Please help me to create product with these property.

Regards,
Agalya