Using Angular 5 with Bootstrap Studio

I am creating Web pages using Bootstrap Studio, then trying to move them into an Angular 5 application. I am having various difficulties getting the CSS set up correctly since there are so many files generated during export. I have tried copy/paste but that is problematic as well. Are there any guidelines, tutorials, or other hints for best practices in how to accomplish this?

There are various youtube videos that explain the process of using bootstrap with Angular 2+. I followed a couple of them successfully, can't remember which ones in particular?

What files are being generated that is causing you problems ?

Is it multiple css files and such?