The applicant may amend the application during the course of examination, when required by the Office or for other reasons.
37 C.F.R. §2.71
Part 3 pertaining to both patents and trademarks is placed in the grouping pertaining to patents regulations.
Part 4 is placed in the separate grouping of parts pertaining to patents regulations.
Part 5 is placed in the separate grouping of parts pertaining to patents regulations.