With this example I just did a normal inset then edited it, which is fine it didn’t take long in this example, but I was wondering if there was a specific function, I know some programs have this.
Hmm… interesting, I know that works with the mirror modifier, but it seems to work also if there is no face along the edge you don’t want the inset. I tried “tricking” the inset by hiding the adjoining faces, but unfortunately it didn’t work.
So only if you either delete adjoining faces or p>Selection, inset, then join them back together.