How to setoff ITC of one month to another month?

Veerendra Yenugu (4 Points)

20 March 2018  
In case,we filled the gstr3b without claiming the ITC which is shown on Gstr2a & made the total tax through cash. what we have to do in order to get the benefit of ITC, whether it can be claim refund or adjusted for next month.
kindly reply.....