noun which may take the genitive case particle 'no'
multi-item; multi-field; multi-category
Used as a no-adjective to describe something that involves multiple items, fields, or categories. Common in technical and formal contexts such as surveys, forms, and databases.
This survey includes questions covering multiple items.
Process multi-item data at once.
多面的 means multifaceted or many-sided, often used for perspectives or approaches, whereas 多項目 is about countable items or fields.
Compound of 多 (many) and 項目 (item, field). A straightforward Sino-Japanese formation.