Save Folder in Mail App?

[MikeYuse0406]

I am not sure if I am posting this in the right place, if not, please move to the right place.

I would like to know if there is a way to create a "saved" folder in the mail app so that I can keep certain emails saved for future references. If there is no possible way within the app, would it be possible to do so by modifying the mail app via ssh? I rely on emails for several purposes and need a save folder option. However, I seem not to find one and thought maybe I can customized such option via ssh. Has anyone tried this before or have any ideas oh how to create the saved folder.

Thanks in advance!