Prayer

If you are referring to 3 rak’ah witr, it is not permissible to sit in the 1st tashahud as in Maghrib.

It is Sunnah but it is not mandatory.

The Sunnah is to point the finger and moving it in its place.

No, it is not.

Should start with Fatiha.

There is no expiation. If she didn’t recite the tahiyat, her prayer is invalid unless she is a new revert and doesn’t know it.

He must pray Fajar as soon as he wakes up.

The most authentic opinion is that Fajr is the first prayer of the day.

No, this is not considered to be reciting it.

This is not permissible. You have to either look for a more suitable job or reach a compromise with your boss to give you time and you make it later or reduces your par for allowing you to pray.