Report to List Materials used in a BOM

Dear Sir,

We have a Make-to-Order scenario and each FERT has been given an Item-Code which denote the Project Id also .

The BOM for the FERT is a multilevel one and consist of ROH / HALB category of items . There may be cases when an Item is being used in more than one places .

We are required to write a Report , to display item wise list comprising of : Item code , Item Category , Cumulative Quantity .

I Request SAP Gurus , to kindly guide me how to develop such a report please .

Regards

S M Mittal