To bring or carry something/someone into a place (to bring in; to carry in).
劇場に飲食物を持ち込むことは禁止されています。
Bringing food and drinks into the theater is prohibited.
試験会場に携帯電話を持ち込んではいけない。
You must not bring a mobile phone into the exam room.
古い家具を新しい家に持ち込んだ。
I brought the old furniture into the new house.
To approach someone with a proposal, complaint, or issue; to bring something up to someone (e.g., lodge a complaint, propose a project).
彼は新しい企画を社長に持ち込んだ。
He brought a new project proposal to the company president.
住民が環境問題の苦情を役所に持ち込んだ。
Residents brought complaints about environmental issues to the city office.
問題をチームに持ち込む前に、まず上司に相談した方がいい。
Before bringing the issue to the team, it's better to consult your boss first.
To bring something to another stage or venue (e.g., take a matter to court, extend a match into extra time or playoffs).
試合を延長戦に持ち込んで、チームは逆転勝ちした。
They took the match into extra time and the team won by coming from behind.
その問題を裁判に持ち込むかどうかを弁護士と話している。
We're discussing with a lawyer whether to take the matter to court.
交渉を次の段階に持ち込むための準備を始めた。
We have started preparing to move the negotiations to the next stage.