You can create a batch file by using Notepad, WordPad, or any other plain text editor. Simply type in the MS-DOS commands, one per line, and save the file with a ".bat" extension.
To get help on an MS-DOS command, open an MS-DOS window and type at the command prompt: <command name> /?
To copy a specific file from one specific location to another, use the MS-DOS Copy command:
copy C:\xxx\xxx\filename.ext D:\xxx\xxx
If you need to plug in the path or file name dynamically, I'm afraid that's quite difficult with batch files. It can be done using a hierarchy of nested batch commands, temporary files, and redirection operators, but it's not for beginners (and I'm not sure anybody even remembers how any more, so you might well have to work it out on your own). If you really must do this, you might want to check second hand bookstores for old books like "Running MS-DOS". Some such books had good techniques for making flexible batch files. Rick Sprague