Vat return

Dear sir,

 We are having VAT Registration, in that  we are done 2 kind of sales,  viz,  1)  sale of computer and other items. 2) Construction work (Tower Errection)  we filed  FORM  - I  for Compuer Sales  and FORM -L for Construction, Now we have clarification can we submitt return same VAT No , Sales tax officiel advice file two differnce Vat Registration. if any act like this Please help us

Regards

Venkataraman.r