Permalinks on custom posts

You could change the custom ones into Pages.

why would i want to make them into pages? :/ sorry i dont quite follow

Pages have a different permalink structure, more like you are wanting. They would be out of the flow of Posts, and stand-alone. So instead of trying to make a Post do something it’s not designed to do, you use something that is set up that way: Pages.

You can put whatever you like in front of post or page slugs as long as it does not match any rewrite rules, as long as the slug itself is correct. For example: example.com/gobledygook/hello-world/
Numbers and other post types will match rewrite rules, so don’t use those. All you need to do is filter permalink output so the extra /gobledygook/ is part of the URL. For pages, use the “page_link” filter. Unless you want to apply this to all pages, there needs to be something about the page which code can use to know which links to alter and which to leave as is. It can be a taxonomy term, post meta, something in the slug, whatever as long as there is something.

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