Where does “sota” come from?

sota (Old Occitan) comes from Vulgar Latin subta, from Latin subtus, from Latin sub, from Proto-Italic supo, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

Ancestry of “sota”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	subta	—
2	Latin	subtus	below, underneath, beneath
3	Latin	sub	under, beneath; behind; at the feet of
4	Proto-Italic	supo	under
5	Proto-Indo-European	upó	under, below
6	Proto-Indo-European	h₃ewp-	—

Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Proto-Italic supo →