Separate design system and UI design from 1 single File without losing component connection?

So I created a single design file in Draft, the file consist of UI in one page, the other page with design system(colors, typos, icons, components) that link to the UI design page.

Now that I have subscription and want to this file to project folder, and put the design system into a separated file, and UI design in another file. How do I do that with all the elements and components stay linked together. Thanks