Once a library component is placed into a design, the parent component definition resides in the project, and the link to the library is broken. To update a project component definition with a definition from a library file, select the project you want to update in the Project Manager window, then click Project Tools > Update Definitions on the Tools menu.
The Update Definitions window opens, listing any library definitions that have been edited since they are added to the project, and their original library locations. Use the window to select the item to update, and click Update to finish.
If you wish to remove project definitions that are unused, choose the Project Tools > Remove Unused Definitions command on the Tools menu which opens the Unused Definitions window.