Storage Location

Dear friends

I am having one scenario as follows

Presently client having one mail storage location in which materials are stores

In different Bin such as A-01, C-20 AF-10 whatever (about 200 Bin)

In each such bin there is certain material like 5 different types of valve in A-01

5 different types of barring in AF-10 for example

In present system (non SAP) they can see the stock of material Bin wise

But whenever the bin is empty they will assign the same bin for different material

Means particular bin is not fix for particular material

Please suggest me out of this how to map this in sap & also tell me is WM is suitable?

Point will be rewarded

Thanks in advance