Hey Roger, sorry to resurrect a decade old post but I'm hoping you are still able to answer a question. This C-hook has been working great for the last 2 versions of Mastercam I've been on (2019 and 2022). It has always renamed level 1 from "part" to the name of the sldprt file we are merging. Since updating however, it just renames it to one of the features in the Solidworks feature tree such as "Chamfer #3" or "M4 x 0.7". Any input as to why this might happen? I'm not sure if this is related to the c-hook or if it's due to a change in the way our feature trees are displayed.