Abhayamudra,
You mentioned the 3rd and 4th bases, so I assume you meant the following section:
Sabbakāyapaṭisaṁvedī assasissāmī ti sikkhati,
sabbakāyapaṭisaṁvedī passasissāmī ti sikkhati;
passambhayaṁ kāyasaṅkhāraṁ assasissāmī ti sikkhati,
passambhayaṁ kāyasaṅkhāraṁ passasissāmī ti sikkhati.
The part about “whole bodily formation and calming the bodily formation” is probably about the last 2 verses with the word “passambhayaṁ”.
There’s a forum about key Pali words that addresses the word “passambhayaṁ”: