How to export the style.css of the whole page once its finished?

I want to know how can I export the style.css of all the code to open it in Sublime Text after I finish the webpage. Thanks!

I have no idea what you're asking here. All CSS pages that are used in your page are exported and you can edit them all then. You can even reimport them into BSS after manually editing them, the only thing you may lose is Comments if you added them externally. Your question is confusing as the program does what you need already for exporting.