How to Compile Bootstrap Theme Scss Files in Laravel

I have bit knowledge about how to compile scss file using npm run dev. But now I have Bootstrap html theme folder where all assets files are included like scss and css . i am confused that is i have to @import all bootstrap theme folder scss files name in laravel app.scss file for compile or just copy Bootstrap theme folder scss files and paste on laravel assets/scss folder and run command npm run dev. please help thanks

via Chebli Mohamed