In Dynamics 365 Finance & Operations, TableGroup is a design-time classification on a table (and views can also be assigned to a table group). Microsoft describes it as a way to categorize tables according to the type of data they contain, and notes three practical uses. First, it can help define whether the system should prompt users when they update/delete data on pages that use the table as a data source. Second, it can be used to filter records during data export. And lastly, it is a general categorization mechanism for tables/views.