How does one calm one's bodily fabrications?

I personally start looking at the speed of the breath and then it slows down. In the Tripitaka are there recommended methods to accomplish this? What do different teachers and commentaries say about it? One meditation teacher I found who emphasizes calming of the bodily is Bhante Vimalaramsi in 6Rs . But exact mechanics is not really covered on how the relaxation happens. Does this also lead to or linked to calming of the bodily fabrications? Are there more explicit instructions, especially those we can source from the Tripitaka?