How do I delete microsoft documents from my Mac Pro

Deleting "Microsoft" documents is done exactly the same as deleting files of any other type. If you're new to Mac, on your Mac Desktop go to Help> Mac Help in the Finder menu & enter the term delete files in the Search field.

In addition to the basic explanation there, newer versions of macOS permit deleting files in the File> Open dialog of the program you're using: Right-click the file name & select Move to Trash or use the Command+delete keyboard shortcut. You also can select multiple files to delete all at once as well as delete Folders. In the Save/Save As dialog you can delete folders but not individual files.

If you continue to have a problem please fully explain the issue: Exactly how are you attempting to go about it & specifically what is preventing you from doing so. The better you describe the issue the more likely someone will be able to provide the assistance or explanation you need.