Sure.
Under subclause 21(1) with respect to subsection 77(3), after it's been determined that a substance is toxic, there's a part that says “Mandatory proposal”. It says if the substance is toxic and persistent and bioaccumulative, if it is a danger to human health and is carcinogenic, mutagenic or toxic to reproduction, or it is otherwise of highest risk, then it must be put on part 1 of schedule 1. For all three of those, that provision also says it's as defined in the regulations.
That's where you have the specific mention of CMR substances as being those that should be on schedule 1. That's CMR as defined by the regulations.
If you go to section 67, you see that section 67 about the regulation-making power. It says already that you can make regulations about characteristics of a substance. I want to make sure that I'm right about this. It includes substances that are carcinogenic, mutagenic or toxic to reproduction. This provision you're looking at right now is about the regulation-making authority for substances of highest risk.
Does that make sense?
CMRs are specifically mentioned where it says that you should put them on part 1. Then in this part about regulation-making authority, there are two subsections. One is about defining what CMR means and one is about the highest risk.