I need some help with Sublime 4 please.

At the moment I use Prepros to compile my css. I am trying to mimic the process of Prepros so i can us Sublime only. I have:

• installed the SASS package,
• created build system: BuildIntoNewFolder
• selected Save All On Build

This is my setup: I wrote my scss in hidden scss file here: /assets/scss/_style-header.scss and /assets/scss/_style-footer.scss

The hidden scss are imported to: /assets/scss/style.scss

The style.scss are the compiled to: /assets/css/_style.css

This all happens by simply saving _style-header.scss

Thank you