There is no way to save a search based on Categories (or level names). Categories (level names in dgns) have significant meaning in the models. Being able to search for a group of categories that have a descriptive word (rebar, top, abut, etc) is a very fast way for us to find information in the model. For instance, I am looking at the Top Mat of reinforcement in a bridge deck - every rebar in that group includes the word "top" in its level name. Having a saved data visualization or saved advanced search based on that word would be a significant time saver for creating saved views and breaking down information. Yes, you can search for "top" under the model tree, but it is very slow and cannot be saved.