HSK 4
Zhège bùmén fùzé shàngchuánxiàdá.
This department is responsible for information flow between upper and lower levels.
HSK 5
Mìshū de gōngzuò jiùshì shàngchuánxiàdá.
A secretary's job is to relay messages up and down the chain.
HSK 6
Tā zài shàngchuánxiàdá fāngmiàn fēicháng chènzhí.
He's highly competent at relaying information up and down.