If you are using PTT in Sony Vegas you must use track layers for text block motion = rotates etc
As you bring in the first lines = track layers of text with PTT and subsequent text tracks create a parent controller
That is a parent track for that group of text tracks. As you bring in more text tracks of PTT text you create a new parent track to contain the first parent controller and all the new PTT text tracks as you build up more PTT text tracks you create a new parent controller track that contains all the previous controller tracks and so forth.
The reason for this is that the parent controller controls all the other tracks as one fused unit.