How to define area based capacity in SAP WM?

I had configured basic WM is working without capacity requirement, strategy type ‘L” – Next Empty Bin.

Now my client requirement is to do automatic bin selection based on cartoon size. All bins are almost

of same size but size of cartoons differs from article to article.

For example:-

Bin Size= 20 cm x 20 cm x 20 cm = Total Area = 800 cm

Cartoons Sizes is 05 cm x 05 cm x 05 cm = Total Area = 75 cm

I bin can accommodate = 800/75 = 10.6 Cartoons.

1. Can you pl. guide where is can put volume based capacity for bin??
2. Guide what is use of “capacity usage” Field in Material master??

At present i am not using SU Management for storage type.

Waiting for reply,

Umesh Ligade.