How to map

My client is having 4 seperate lines of business like chemicals,plastics,metals,fertilizers and in each line ther are seperate section of products eg.There are six business units make four different kinds of products:

1.chemicals-oxygenates,aeromatics,fiber intermediates.

2.Polystics-PVC and polyester,Polyolefins-

3.Fertilisers-Urea,Ammonia and phosphates,Sulphuric acid,

4.Metals

company also has four corporate departments: Corporate Finance, Corporate Human Resources, Corporate Control, and Research and Technology (R&T). this client is operating in 10 coutries.

Can anybody suggest me how to map the enterprise structure fo it.

Regards,

cpdatt