relevant items; applicable items
Formal term used in documents, forms, or official contexts to refer to items that meet certain criteria or are applicable.
If there are any applicable items, please check them.
Fill in the relevant items on the application form.
該当 is a suru-verb/no-adjective meaning 'corresponding' or 'applicable', while 該当事項 is a compound noun specifically meaning 'relevant items'.
事項 means 'matters' or 'items' and is used in formal contexts; 該当事項 narrows it to items that are applicable.
Compound of 該当 (applicable) and 事項 (items, matters). The kanji 該 means 'the above-mentioned' or 'the said', 当 means 'hit' or 'correspond', 事 means 'matter', and 項 means 'clause' or 'item'.