Converting/saving - wrong audio

[Exisle]

Basically I have a file with multiple audios and subtitles, whenever I try to save the file to .mp4, it saves to the audio track 1, that comes with the file originally. Im just wondering is it possible when I save the file to .mp4 I can have Audio Track 2 being saved into the .mp4 ?
Also I cannot seem to get the subtitles showing up in the finished .mp4

Thanks for the help guys !

[Rémi Denis-Courmont]

I doubt this functionality can be had with the user interface.