Gst cancel aur stock treatment

See U need to cancel the GST Registration No. Once you stop Business or transaction and has no intention to do it further. 

Prior to cancellation you need to file all the returns along with appropriate details of ITC available and claim 
  

While applying for cancellation you need to disclose ITc claimed and Stock in hand

Further you need to discharge GST on the stock in hand (which would normally be ITC claimed).

Note: All returns shall be filed by the taxpayer before applying for cancellation

To avoid compliance  Non claiming of ITC & showing stock in hand would bring Litigation moreover