One of the popular schemes for exporters is EPCG. You can import a machinery at any stage i.e. pre/post-production or during production at zero customs duties provided you undertake an export obligation i.e. six times the duty saved. You need to fulfill this within six years from date of issue of authorization. Many exporters have successfully used this scheme for years. Another variant is that you get the machinery from the local market known as indigenous sourcing.