Kindly follow below mention path and add new mibs in entuity.
While you can copy mibs to the directory that Ashish mentioned, in order to use them, you must load them into the system. There are a set of tutorial videos for the Entuity Event Management System. From the Web UI, go to Administration -> Events -> Event Administration. There is a hyperlink on this page labeled Tutorial Videos. Click that and then click on the training video labeled Trap Management.