Import Purchase Process

Dear Experts,

In our business current scenerio when we purchase the material from other countries we dont know the Excise Duty, Air Freight, Local Freight details. Once the material came to Port we will pay the excise duty amount to Govt through online. Then receive the mateial that time only, we know the Air freight & Local freight  that is we make Standard Invoice. So, after receive the material all excess charges (Excise Duty,Freight charges) not included in material cost. So, our end users calculated each consignment charges manullay and arrive the material cost. But If it is domestic purchase when we