Which operation does not automatically create expressions?

Opening a part typically involves loading the existing data and geometry of the model into the software without introducing any new parameters or expressions. When you open a part file, the software simply reads the information contained within it, including its features and their relationships, but does not initiate any new expressions based on that data.

On the other hand, feature creation does indeed result in the automatic generation of expressions, as new features may require dimensions, constraints, or parameters that are defined during the creation process. Similarly, when modifying variables, the system often updates expressions to reflect these changes, ensuring that the model remains consistent and accurate. Part saving can also involve the retention of parameters or expressions that have been set during the modeling phase, further tying it to active expression management.

Thus, the operation that does not lead to the automatic creation of expressions is opening a part, as it functions primarily as a data retrieval action rather than a modification or creation activity.