You can achieve this with a couple lines of code in the onEnter action of your slide.
Each slide where a new TEB is located will need a slightly modified code because we need to address different named text boxes and reference different variables. I will provide the code for a transition from slide 1 to slide 2 as an example and hopefully you can see how to modify it for your own needs.
setTimeout(function() {
TEB2=TEB1;
document.getElementById("box2_inputField").value=TEB1;
},100);
Basically we have three things going on here.
1. A timeout that has two commands which execute after a tenth of a second after entering the slide.
2. We set the variable associated with the TEB on slide 2 to equal whatever was entered into the TEB on slide 1
3. We find the actual text entry box input field on slide 2 and set its visible contents to be equal to the TEB1 variable
Subsequent slides will just need to update the name of the variable and the name of the TEB itself.
Hope this helps. Let me know if you need any further assistance with this.