Question about Confined Shear Task in Forcite Module

Hello,

Currently, I am learning confined shear task. I saw that in the manual, it says "during the shear process, the wall atoms are allowed to fluctuate about (moving) equilibrium positions, to which they are attached by harmonic springs". I'm curious of it and I would like to ask how to do it through script in Materials Studio. Would be really appreciate it if anyone can give me some ideas.

Thanks,