What happens to expressions created in a Siemens NX model when the feature is deleted?

When a feature in a Siemens NX model is deleted, the expressions associated with that feature are automatically deleted as well. This is because expressions in NX are often closely tied to the parameters and geometry of the features they refer to. When the feature is removed, the system recognizes that the basis for those expressions no longer exists and thus cleans up by removing the corresponding expressions.

By contrast, options implying that expressions are retained or left in an invalid state do not accurately reflect how NX manages its data integrity. Similarly, the idea that expressions would simply change to zero does not align with the behavior of NX, as this would not accurately represent the intended design parameters after a deletion.