L/c & bank gaurantee procedure

They are basically non fund based credits .Bank Insist margin for openingof Bank gurantees or LCS if you do not have limits with Banks .LCS are used for making payments for raw materials or Capital Goods you can get the Form from banks where you have operating bank account .These components consists of many  Formalities better you can use google to learn about them or take the help of some experts or a banker who may guide you accordingly

Bank gurantees  may be Financial Bank guarantee or Performance Bank Guranantee learn more about them in Google