1. Go to File > Save As.

  2. Select OneDrive so you can get to your document from anywhere.

    Save personal files to OneDrive - Personal, and work files to your company OneDrive. You can also save to another location in the list like This PC.

    Save as

  3. Enter a name, and select Save.

Note: When your document is stored in OneDrive, Word will save your changes automatically.


Source: Microsoft