〜に応じて
according to, in line with, as needed
Noun + に応じて · に応じた + Noun
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に応じて says something changes to match something else: 収入に応じて、税金の額が変わる, "the amount of tax varies according to income".
The first noun is a variable (income, season, ability, a customer's wishes) and the second half adjusts to it. It's like によって ("depending on"), but with the sense of deliberately responding or matching.
必要に応じて, "as needed", is a very common set phrase in instructions and business writing.
Before a noun, it becomes に応じた: 能力に応じた仕事, "work that matches your abilities". Don't confuse it with に応えて, "in response to (hopes, cheers)", which is written with a different kanji.
Examples
収入に応じて、税金の額が変わる。
The amount of tax varies according to income.
お客様の希望に応じて、料理を作ります。
We cook to suit our customers' wishes.
季節に応じて、メニューを変えている。
We change the menu with the seasons.
能力に応じた仕事をする。
Do work that matches your abilities.
必要に応じて、資料を追加します。
We'll add more materials as needed.