How to deactivate contact between load steps

You can use the MODCHG card to deactivate contacts for a certain load case.
https://2022.help.altair.com/2022.1/hwsolvers/os/topics/solvers/os/modchg_sub_r.htm

Hi Ben, 

Thanks for your reply. I also thought that MODCHG card would help me, but unfortunately MODCHG is not supported for a non-linear transient heat transfer subcase nor for transient heat transfer. Do you have any other idea?

Thank you very much. 

Hi Ben, 

Thanks for your reply. I also thought that MODCHG card would help me, but unfortunately MODCHG is not supported for a non-linear transient heat transfer subcase nor for transient heat transfer. Do you have any other idea?

Thank you very much. 

Unfortunately I can't think of another good way to do this.

Create two element sets one with  with contact nodes and other without contact nodes .

Its like not applying globally.

For creating two elements sets use local coordinate system.