Hi Dave,
if you want to specify it you could add a specific Attribute to the User Entity. For example you can perform this computation by defining a Derived Attribute.
For more details: https://my.webratio.com/learn/learningobject/extending-the-domain-model-derivation-v-72
Moreover you can use a Switch to define cases and perform specific operations depending on the value of the Attribute. https://my.webratio.com/learn/learningobject/how-to-use-the-switch-unit