Mentalist is able to save chain files for future use. To save a chain file, go to Load/Save→Save Chain, which will then prompt you where you'd like to save the file. For organization, saved Mentalist chains should have the extension .mentalist, which is enforced in the application on most OSes.
Mentalist is able to load chain files by clicking on Load/Save→Load Chain. If the chain file refers to a user-specified file that is not present on the current system, Mentalist will put a red box around that file attribute and will prevent processing. To fix this, click on the Fix... button next to the file and specify a local file in its place.