To create shared member parents at the same generation by using the generation references build method, define the field type for the parent of the shared members as DUPGEN. A duplicate generation is a generation with shared members for children. Use the same GEN number as the primary member.
For example, to create the Diet parent and share members 100-20, 200-20, 300-20, and 400-20, use the sample data source file (SHGENREF.TXT) and set up the rules file so that the fields look like the sample rules file (SHGENREF.RUL) shown in Figure 92, Sample Rules File: Members Shared at the Same Generation Using Generation References. 100 is the Cola family, 200 is the Root Beer family, 300 is the Cream Soda family, and -20 appended to the family name (for example, 100–20) indicates a diet version of the soda.