I have republished the course I was trialing things on.
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The current courses display as either accredited or unaccredited, there is no option to choose, but then that causes confusion as there are two products of almost the same name. I think the variant would be a better option. I will update the current products once I have the best solution.
I used books in the previous example, as I thought this would be more understandable. I have now used key rings as per the example in the link.
Example 1
Course base price £300
Number of people attending 10
Regulated qualification yes
Certificate and resource price p/p £15
Keyrings required Yes £1.50
£300 + (10 * 15) + (10 * 1.50) = £465
Example 2
Course base price £300
Number of people attending 10
Regulated qualification no
Certificate and resource price p/p £5
Keyrings required No £1.50
£300 + (10 * 5) + (0 * 1.50) = £350
Alternative way
Example 1
Course base price £300
Number of people attending 10
Regulated qualification yes £10
Resource price p/p £5
Keyrings required Yes £1.50
£300 + (10 * 10) + (10 * 5) + (10 * 1.50) = £465
Example 2
Course base price £300
Number of people attending 10
Regulated qualification No £0
Resource price p/p £5
Keyrings required No £1.50
£300 + (10 * 5) + (10 * 0) + (0 * 1.50) = £350
Please note the regulated qualification price we are charged can vary per course.
When the user chooses regulated qualification or not, this should change some of the information displayed.
I hope this makes sense