GST Consultant
15986 Points
Joined March 2013
If he is your partner then the GST registration should have been of the partnership. Why change registration since he can continue being the partner even if he is abroad. If he ceases to be a partner then you can add a partner and carry on the registration as it is. If you want to change it to proprietorship then you will have to take a new registration.
At any rate your query seems incomplete as to how he can be your partner if GST registration is under sole proprietorship