So when you create a child theme, initially, everything is inherited from the parent. To make modifications, you will need to clone the module/ template and add it to the new child theme in the same path as the parent.
So, pretending you want to modify a slider module
If that module is in the following path in the parent theme:
Theme-parent/modules/slider
the you would create a copy at this path
Theme-child/modules/slider
Does that make sense?
From the FAQs on the page you references, the 2nd and 3rd points are relevant
What assets are inherited from the parent theme? All files are inherited from the parent theme unless they are overwritten in the child theme.
How can I override a particular asset from the parent theme? A file in the same relative path of a child theme will overwrite the equivalent file from the parent theme. So, for instance, to overwrite @marketplace/parent/theme/templates/about.html you can create /child/theme/templates/about.html and make your edits to the new file. The new file will take effect instead of the inherited file. Note that this applies to your fields.json file as well as other files in the theme.
Hi Dennis, thanks for getting back to me. Looks like I can't clone modules or templates since it's a marketplace theme. I'm guessing I could clone the theme and then move the updated modules I want into the child them?