Use this feature to substitute all parts of a certain type with a different part. When the feature is selected, you are prompted for the location of the part reference to substitute and using the button options available on the ConversationBar, All, Screen, Select and Assem to chose the references to substitute. The Assem button is similar to the All button that appears in the Conversation Bar for several KeyCreator functions, except that Assem performs the function on the entire assembly. This means that clicking Assem performs the function for all of the references in the current part. It also performs the function on all parts referenced directly or indirectly by those references, progressing down the assembly tree to process all the parts.