Marc/Mentat Command path

Hi,

I am running Mentat and I want to execute my procedure files from. %installation_path_of_mentat%\procedures\user_proc.proc.

I do not know how to create a mentat path variable and use it in the exec procedure command. So in the end command would look like:

*exec_procedure {%mentat_path%}\procedure\user_proc.proc

The above command takes the {%mentat_path%} literally and does not read as a variable.

Can someone guide me the way out of this issue ?

Thanks.