Aid, Help, Assistance
noun, verbal noun, の adjective
A supplement of help is an aid or help or assistance. Not a full on help, but an aid of sorts.
ほさ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
私はトーフグ営業部の補佐として働きました。
I worked as an assistant in the Tofugu sales department.