Feature Recognition Tool > About Feature Recognition Reverse Modeling
  
About Feature Recognition Reverse Modeling
When you work with Feature Recognition you use reverse feature modeling. You start with what is typically the last features in the model. For example, you can replace an imported round with a Creo Parametric round, then use Insert Mode to create the next lowest-level feature between the Remove feature and the new round. Next, you can resume the round and reroute any failed references. You can use this process repeatedly to replace imported features in higher levels of the model hierarchy.
 
* The top level imported feature cannot be replaced with a Creo Parametric feature.