Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
How easy it is to do depends entirely on the version of Office you have.
Office 365 or 2016 makes it a PITA. It can be done but requires a work around using a special tool
Office 2013 may allow it.
Office 2010 and earlier definitely allow you. When you start the install, select the "customize" option.
For 2016 you can use the Office Deployment Toolkit. You have to edit the "XML" to customize the installation
2016 10 24- How to deploy applications with the Microsoft Deployment Toolkit - Business
http://www.techrepublic.com/article/how-to-deploy-applications-with-microsoft-deployment-toolkit/
Discover how to install applications when deploying devices using the Microsoft Deployment Toolkit (MDT). This illustrated tutorial takes you through the steps.
There are also links to several more articles on the Deployment
Note: installing even just one application is the same as installing the whole suite in terms of the installation count. You cannot "split" an installation count by putting one application on one computer and a different application on another computer.