Dear sir,
If you are an australia based company and selling goods to india, in india only custom duty on import shall be applicable. also at the time of local sales in india local sales tax shall be applicable and income earned by your counter part in india, income tax shall be payable.
There is no limit for remittance of fund subject to real movement of fund take place and all necessary documents submitted to bank in time. also an Import Export Code required to be taken by indian counterpart on such trasanction.