Subpart
/ˈsʌbˌpɑː(ɹ)t/
"Subpart" in a Sentence (3 examples)
Holonyms: part; portion; (sometimes) subassembly; assembly
Near-synonyms: subportion, subsection
You will find your obligations in this regard clearly defined in Part D, Subpart b, Section 8 of the second Addendum to the contract.