The *.sl is SERs very own format (actually a zip with the site lists). You can import that directly to SERs site lists.
@skyking If you take a look at this post asiavirtualsolutions.com/correctly-use-gsa-global-site-list/ scroll down to the bottom of the post just below the video, there is a section explaining how to import target urls. However that is based on the assumption that the list is already sorted and the platforms identified.Your Question is valid and i think something many new users have in their mind. Feel free to reach out to me vis my site, if you would like me to create a dedicated post and a walk thru video of how to add links scraped with Scrapebox