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Connect option field to reference field in CMS

Hello there,

I’m designing a website where people can search for a specific car.
I created multiple CMS collection lists, for example, a list for all the car brands, all the car models,…

if you navigate to Occasion aanbod - deautolijn.nl

you can see a list of cars, and you can filter them.

I ran into 1 problem, there are more than 800 car models, I imported them with the CSV importer into the CMS.

But I want to display all car models in an option list (like the other option lists in the filter)
I can input them manually, but that will take ages.

is there a way to go around this problem and import or add everything at once?

I tried adding a custom embed with the HTML, but it tells me I can’t exceed 10.000 characters.

any help is appreciated.