Word’s file version feature lets you save multiple versions of the same document in the same file. You can delete older versions of the document in order to reduce the file size.
To delete one or more versions of a document, follow these steps:
On the File menu, click Versions.
Select the version of the document that you want to delete. Use the Ctrl key to select more than one version.
4. Click Save when you are finished deleting old versions.