Assuming it's not wildly different over there in the US, goods must be declared when the goods is at the border if you wish to use or transfer the goods, and tariffs must be paid. For a ship this will be the port, at least that's how it is here.
Alternatively you can put the goods in a bonded warehouse[1], and leave it there until you wish to use it or transfer it to someone else. It's not free, but it allows you to postpone the declaration, and hence payment of tariffs, until you take the goods out of the bonded warehouse.
Typically a bonded warehouse requires physical security, paperwork and a bank guarantee to prevent goods disappearing, so it isn't free to keep goods there.
Alternatively you can put the goods in a bonded warehouse[1], and leave it there until you wish to use it or transfer it to someone else. It's not free, but it allows you to postpone the declaration, and hence payment of tariffs, until you take the goods out of the bonded warehouse.
Typically a bonded warehouse requires physical security, paperwork and a bank guarantee to prevent goods disappearing, so it isn't free to keep goods there.
[1]: https://en.wikipedia.org/wiki/Bonded_warehouse