The clauses of the bill are aligned with the provisions of the act they seek to amend, and so, unfortunately, because our Income Tax Act is a somewhat complex statute, you'll see some measures appearing in multiple clauses, and some clauses that touch on multiple measures will have a few different things as you have here.
In this case, the section of the Income Tax Act being amended is section 81. It deals with, effectively, various tax exemptions both relating to veterans and also relating to these allowances in subclause 6(3) of the bill.
All of the amendments in clause 6 amend the same section of the Income Tax Act. That's why they were put together.