Hi Richard Mangan,
If the quizzes are not being taken at the same time (all the questions in one sitting), then they are distinct separate quizzes. And it works out great that you have a set number of points per quiz already.
It sounds like you already have your assignments into different categories/groups, so setting up the Canvas Assignment Groups should be easy for you knowing how much weight each group is to the overall grade.
How do I add an assignment group in a course?
How do I weight the final course grade based on assignment groups?

You can have as many assignment groups as you want, and thus create the progressive quiz if all the quizzes in a group will add up to a 100 pt assignment that you know how much it impacts the overall course grade.
And then the beauty of assignment groups is that you can also get them to display separately in the gradebook using Filters.
https://community.canvaslms.com/docs/DOC-16541-4152814167

Hope these guides help,
Cheers - Shar
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