Modify > Declare inverse property
This feature is available from the Modify Menu of (relationship) property declarations in Ontologies. It opens a dialog that helps you easily create an inverse property for the current property.
When you create a new relationship property, the dialog already offers you to also create an inverse property. In case you missed that or have to work with ontologies that you did not create, you can use this feature here as a short-cut.
Hint
It is generally a good practice to declare inverse properties. They do not produce overhead in terms of storage, and make it easier to navigate a knowledge graph in both directions.
See Also
Further Reading on SHACL
Further Reading on Ontologies
Further Reading on Modify Menu
Further Reading on TopBraid