Unable to add custom interior sounds

Hi! No matter how i tried i'am unable to find a way to restrict new SFX (not original Event:>Vehicle>Interior) to interior only, what i'm trying to achieve is similar how signals and handbrake sounds work, but for my own sounds, using soundscape or not. Maybe i'm missing something, is there a way to achieve it?

 

since there hasnt been a reply in a month, imma bump it to give more awareness. but as to your question, check the hirochi ccf?

 

anyways, did it work? if not then idk. also, what happened to kiseki and my rx7 mod? he just randomly ghosted me and never came back. since he said you were his brother, you know anything?