A practical file index for Section 44AB work: Form 3CA/3CB/3CD, TDS/TCS, MSME 43B(h), GST expense breakup, ICDS, cash transactions and transition checks. Use it as a workpaper hub before jumping into individual formats.
Form 3CD is the report, not the work. The audit file should show the source schedule, test performed, exception conclusion and reviewer sign-off behind each reported clause. These formats are designed to keep that trail visible before the e-filing utility is populated.