This workflow will outline how to access the RDA Helper screen as well describe the structure of the fields to which this tool applies and the abbreviations covered by abbreviation expansion.
- Open the .mrk file by selecting it in the folder, which should open the file in MarcEditor, or open MarcEditor from the MarcEdit home screen and select the file in File->Open.
- Select Tools > RDA Helper from the menu bar, as below:

3. The following dialog box should appear:

4. This presents a list of options for RDA fields that could be added to records. Rather than re-state how the various fields on the left side of the dialog box are populated from material present in the record, please refer to the above Table of RDA Mapping in MarcEdit to find how MarcEdit will perform the creation of RDA fields. This dialog box also presents options for expanding abbreviations, which I will outline below.
5. By default, MarcEdit has the functionality to expand abbreviations within various fields. To see the list of abbreviations it will expand by default, click “Edit List.” To see the fields MarcEdit will evaluate and perform the Expand Abbreviations function
upon, click “Edit Fields.” Examples of each screen can be found below.


When editing, be careful to follow the formatting of the examples. When you have finished editing either, select File > Save to add the new abbreviations/fields.