Transient Thermal Problem....Plz help

Hi
    I am a naive member to this group. I have to model a transient
thermal problem.
    My problem involves constant updating of the surface on which the
load is applied for every time step,
(1) Is there any way ansys could delete the elements crossing the
matls melting point?
(2) If not how do i update the surface for every time step (how do i
program it)
(3) also i would like to know 3 dimensional heat flux inside the
material so that i could update the new surface with the elements in z
removed in addition to the x and y axis elements

I would like to thank in advance for any body who would help me out in
modelling this....

Saravanan