1. Tally provides 28 predefined groups of accounts, including 15 primary groups and 13 subgroups. 9 primary groups are used for the balance sheet and 6 for the trading and profit & loss account. 2. The document lists the predefined primary groups and subgroups and where they appear - balance sheet, trading, or profit & loss. 3. It provides instructions for creating a new customized group, altering an existing group, and deleting a group. It also describes how to display multiple groups or make multiple alterations through the "Multiple Display/Alter" option.