Embodiments of the present invention include a method and system for a category based user interface for management of information stored on auxiliary storage of a portable computer system, e.g., a PDA. In one embodiment, files can be copied to a removable storage unit by changing the category name to which they are assigned. For example, a game that is stored on the main memory of a PDA can be copied to a memory card by changing the category of the game to a category that is associated with the expansion memory. In another embodiment, the user has the option of keeping the application in two categories or deleting the original instance. For example, after copying a game from the PDA to a memory card, the user can decide if the game will remain on the PDA or it will be removed. Alternatively, an application can also be copied from the expansion memory to the main memory by changing the category of the application to a category that is associated with the main memory.