I tried to do the same but if I parameterize and pick the value from data table, say 5, i.e Available .
It may happen that at run time the tree contains Available . When I will move any item from Available to Added it will change to Available .
Pls refer the attached file.....Hope that clear the picture.
In the object repository, click on your object (here Available ). In the object description, you will find a property called 'regexpwndtitle'. Its value is normally set to 'Available '. Change this value to 'Available \[.*\]'. This will solve your problem.