how to add a new property type of externals in windows process TortoiseProc.exe

[tortoisesvn+APn2wQetON_cj5SQyVzjaPc395DHf9gsIHHiClyUELgcOXhfL-QZ]

i am unity game developer with windows os ,in my project i need some externals 
.take update my project for example,sample code like this 

 string arg = "/command:update /closeonend:0 /path:\"";

private static void SvnCommandRun(string arg)
        {
            string workDirectory = 
Application.dataPath.Remove(Application.dataPath.LastIndexOf("/Assets", 
StringComparison.Ordinal));
            System.Diagnostics.Process.Start(new 
System.Diagnostics.ProcessStartInfo
            {
                UseShellExecute = false,
                CreateNoWindow = true,
                FileName = "TortoiseProc",
                Arguments = arg,
                WorkingDirectory = workDirectory
            });
        }

but ,i don't know how to add a new property type of externals in typing 
code,not mouse operating.

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