Additional Scripts

Hi. I have a large project I'm working on and inside this project I'm developing two sites. They share a lot of similarities but also have unique features for each.

I'm keeping all of my design files inside of a single project folder and I was wondering if there is a way to add additional scripts to my package.json so that I can target which site to compile. I wasn't sure if I could specify a specific webpack.mix.js file or if there was a "site" like flag I could use.