Create a custom symbol

I have this index(LNCx) i would like to see it as candlesticks and be able to trade it like USDIndex, then we will try to create custom symbol for currencies on the index based on weighing per currency e.g. LNCx/USD=XX.XXXX ;LNCx/EUR=XX.XXXX ;LNCx/AUD=XX.XXXX and so on until all currencies in our index are covered. I want to be able to set spread in the Index(LNCx) and Custom Symbol(LNCx/ZAR). My index you a formula similar to USDIndex.