Yes, you can. You can call interpolation functions within the parametric surface geometry primitive.

For a related example, see:

https://www.comsol.com/blogs/how-to-generate-random-surfaces-in-comsol-multiphysics/

Entirely separately from that, you may also find this article interesting:

https://www.comsol.com/blogs/using-radial-basis-functions-for-surface-interpolation/

for example I have created a surface (x,y,z) in the interpolation function and I want to create the same surface for my geometry. ]]>

How about import a scalar function of (x,y,z,t) as spreadsheet/txt file? Thanks ]]>