We are manufacturers of Water purifying systems/Plant, which is used for water filtration in Pharmaceutical industry. We have sale across India. We are getting Purchase order for supply & service ( Erection, Commissioning, Fitment, Installation)both are separate order. We paid Excise Duty, VAT (Within Maharashtra), CST(Interstate Sale), Service Tax For service provided service. How would we get benefit of WCT ??? What will be the benefit if WCT is applicable to us ??? What will be procedure and tax structure for WCT ??