Transfer "Trip" from one BaseCamp to antother — how should I do it?

I've created "trip" with several days, points and routes on one of my computers in BaseCamp. I could edit it as "Trip", it has special structure, etc.
I need to transfer it to other computer, with BaseCamp too. I've tried:

(1) Export to GDB and import it.
(2) Export to GPX and import it.
(3) Store to cloud & sync at another computer.

In all three cases second BaseCamp sees only "elements" of trip — points and routes — but not trip-as-trip.

How could I transfer trip from one basecamp to antoher?