Interpolating 3-D data

Hi all

I am trying to use some 3-D data i.e. temperature profile across and x and y surface. The data is stored in and excel file.
I want to interpolate the data to form a function as T = f(x,y) and then use that function in the model.
I have seen COMSOL can easily interpolate 2-D data, but not sure how to deal with this 3-D data.

Any suggestions on how to do this in COMSOL ?