Before this ticket gets assigned to my colleagues, I will try to help.
I am not sure what is the exact name of the plugin that you are using and I also did not use a plugin like this with WPML before.
My recommendation is to see if there's any documentation online (you can search by that plugin's name + add "wpml") or you can get in touch with the support team of that plugin to see if their plugin is compatible with WPML, and, if it is, ask them how you can accomplish what you mentioned.