TDS claim for gst

First of all very all the details of deducted amount then accept transaction accordingly on gst portal
When you will accept and submit return amount will be credited in your cash ledger

Find the option TDS/TCS under Return menu & Select the same & Accept the Entries therein & finally click on button proceed to file . As soon as the return is filed same will get reflected in your cash ledger . 

Can take printout of certificate 7A from option "View/Download Certificate " on the portal