Bootstrap Studio allows you to link external CSS files without importing them. This can be useful if you want to include things like css libraries, themes and fonts. They are not stored as files in your project, instead they're included in
<link> tags in the page's
You can do this by right clicking on the Styles group in the Design panel and selecting "Link External CSS".
Then you need to enter the url of the file you want to link in your project and click the "Import" button.
Keep in mind that Bootstrap Studio caches external stylesheets for some time. If you want to get the latest version of the linked file, you need to right click it, and choose the "Refresh" option.