I am creating a Custom Library in Simulink and I have some doubts: How can I create subcategories to clasify the blocks properly? Also, in order to laod my library to the Library Browser, I have used Callbacks but I need to Refresh the Browser each time I close Matlab so that I have the Custom Library available. What do I need to do so that my Custom Library stays permanently in the Library Browser without refreshing, even in the new models?