Customizing Tutor Indigo Theme issue with Javascript Files

Hi All,
We are facing issue with customization of Openedx Theme assets we are looking to incorporate few parts of bootstrap css in Sass files. But the major issue for us to add Static JS files and other assets we have to store can we use Bootstrap css and What will be the path or how we call these css and JS files. we have gone through every where but still not able to figure it out.