Hello,
1) You can get the case transferred. If it happens to be in the same state you need to move an application before the High Court to get this done. If the transfer is out of state you need to obtain approval of the Supreme court of India.
2) The case can get transferred to where your sister is staying.
3) To transfer RCR from Puna to Raipur and if it's interstate you will need to file a portion before the Supreme Court.
4) You don't need to cancel the portion under section 125 even if you file for divorce. You can file for divorce where your sister is staying currently.