Subset of working sheets in the Draft document. A sheet group collects similar types of sheets-such as working sheets, background sheets, and table sheets--into groups in the sheet tab tray. Each group is named and numbered separately.
Example:
When table sheets are produced for different tables, such as two different parts lists, then the table sheets for each parts list are collected into individual groups. The naming convention for the first table sheet group is Table 1:1, Table 1:2, ...; the naming convention for the second table sheet group is Table 2:1, Table 2:2, and so on.
See the help topic, Drawing sheets.