When there is change in the constitution (e.g. Proprietorship to Partnership firm), specific procedure required to be followed for smooth transfer of credit.
Step 1: Apply for New Firm’s GST Number (Specifying reason : change in Constitution.)
Step 2: Transfer Input Tax Credit by filling ITC 02 Form in your old GST number (Services -> Returns -> ITC Forms)
Step 3: Accept ITC 02 form (by visiting Services -> User Services -> ITC02- pending for action) from new GST number
Step 4: Cancel OLD GST number (specifying reason : change in Constitution)
Similar procedure need to be followed in case of Transfer of business due to Merger, Acquisition, De-Merger, Amalgamation.