Stock at subcontractor on a past date

Hi,

     I want to developing an custom report ''stock at subcontracting Vendor on a past date''.

     How can I calculate the stock at subcontracting Vendor on a past date ?

I want the inputs as

• Date
• Vendor
• Material
• Batch
• Plant

And output as

• Vendor
• Material
• Batch
• stock at vendor

Thanks,

Kiran das