These expressions are used to ask for advice and to respond to it.
A: いすが足りません。どうしたらいいでしょうか。
There aren't enough chairs. What should I do?
B: そうですね。じむ室から借りたらいいでしょう。
Let's see. I think borrowing some at the office would be good.
どなたに相談すればいいですか。
Whom I should consult?
It is impolite to use the Vたら／ば いいでしょう pattern when speaking to someone who is older or whose social status is higher than the speaker. One alternative is: Vたらいいと思います。
