GST Refund on Transfer of Business

AMBER (Student) (160 Points)

18 December 2018  
Sir
My Client has two business entity and had separate GST Number. On 31st March 2018 one Business entity has Transfer his stock to another business entity by paying GST on Closing Stock.
The recipient has claimed ITC on Stock and he also have monthly Trading of Purchases and Slaes.
Now I want to claim Refund for Balance of Refund
What Section & application I need to file Refund.
please Help me