It is possible to select text in both a source sentence and its target sentence, which is used to select text to add to a new entry in the TB.
Normally you will be using the grid in Editing Mode. When in Editing Mode you can edit text, and select words or groups of words, but you cannot select text in more than 1 segmentnote.
Déjà Vu X3 also allows you to enter Selection Mode, which does not allow you to edit the text in the cells, but does allow you to select several segments at once, and to perform certain operations on them.
To switch between Editing Mode and Selection Mode press the Enter key on your keyboard.
Hello.
Can one (and how) clear translations for selected segments?
Clearing selected segments is not possible right now.