Calling variable or convert T(x,y,z) = >T(x,y,t) between models

Hi: Please help! I'm very stuck with a quite straightforward problem.

I've got two models:

1) Model 1: 3D Heat Transfer Stationary
2) Model 2: 2D Teat Transfer Time Dependent.

How can I call T(x,y,z) from the model 1 to T(x,y,t) in the model 2 If I want, for example, a source temporal variable Q(x,y,t) with the same shape. i.e. Q(x,y,t)=10*T(x,y,z=t)? The problem is how to change the z axis for the "t" temporal coordinate. How to input a source like this?

Thanks in advance.