Mass Frontier provides a simple way of adding new records (spectra, trees, chromatograms, structures and compound identification information) to a user library. This option creates new library entry with new ID. If you just want to update an existing record you have to use Save Changes in Library option.

To add one or more records from Database Manager to a user library:

1. In Spreadsheet of Database Manager select the record(s) you want to add to the user library.
   
   
2. Choose the Library | Add To Library menu item.
   
   
3. When the Add To Library dialog window appears, select the library you want to add to the record(s) by choosing the appropriate radio button.
   
   
4. Press the Add button.

Note: Only SELECTED records in a Database Manager Spreadsheet can be added to a user library.

A spectrum you intend to add to a library may not contain more than 3000 peaks and the m/z value may not be greater then 3000. A single structure accompanying a spectrum in a user library, may not contain more then 199 non-hydrogen atoms.

You may wish to check whether the structure associated with the spectrum you want to add to a user library, is already present in this library. Mass Frontier allows you to perform redundancy checks by choosing the Check radio button in the Check Structure Redundancy pane. When this option is selected, the program will compare each structure to be added to the library with structures in the selected library. This option, of course, only makes sense if the structure is present, otherwise this option will be ignored.