Claiming unclaimed ITC for the period between July 2017 to Mar 2018

Many of our clients are having unclaimed ITC for precious year between July 2017 to Mar 2018 for Bank charges and other human errors which they discovered in auditing of books

We want to know where to enter the unclaimed ITC for the period between July 2017 to March 2018 in GSTR 3B to claim the input credit

Thanks in Advance