Transfer from one collection to another?

Before asking my question I want to congratulate the developers of Tellico. It is a great program. Before moving to Linux a couple of months ago I used Bookcollector for cataloging the 800 books of my Rare book collection. I am in the process of re-entering by hand all my entries into Tellico, and I love the flexibity offered by the program in the way I can configure the various fields. Really great

Now on with my question. How can I move one entry from collection1.tc into collection2.tc? (either copy or direct move)

Thanks for your help