How to trim multiple solid quickly?

Hello,

I have a lot of piles and the deck above as picture below.

Please guide me the efficient way to trim the top part of multiple piles by using the deck  in one time or the way to do quickly.

I am using OpenRoads Designer CE - 2021 Release 2.

Thank you in advance.

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Tuan

OpenRoads Designer CE - 2021 Release 2

(Version 10.10.21.04)