I have a DMN which calculates (a common unit of work), which I want to plug-in in another DMN. Is there an example for this in kogito examples?
Can someone help me to get me an example.
No, there's no example.
Included models are not supported on DMN editor when it's running on the online version or the VSCode version. This feature will be available soon, so you can keep track of this by looking at KOGITO-697.
However, Included models are supported on DMN editor when it's running on Business Central. So you can create your models there, and execute them on Kogito (just for now) - as @tarilabs said, the runtime already supports it.