The following should do the trick:
1. Create the required MST files.
2. Add them to the folder that contains the office install files.
3. Import office into the Software Catalog.
4. Review the applicability and detection rules that get created by that process, and modfiy or create additional ones if needed.
5. Create a Managed Software Delivery policy that targets the office Software Release, and create the relevant command lines to use the individual MST files.
6. Configure the MSD with a schedule, target, etc, and then enable it for testing.
You only create a MSP file if you wish to deploy a patch to an existing install.