In Workday Adaptive Planning, General Ledger accounts such as Prepaid Advertising are created under Root accounts, which are the primary account categories that form the top-level structure of the Chart of Accounts. Root accounts represent the highest level of the account hierarchy and include categories such as Assets, Liabilities, Equity, Revenue, and Expenses. Prepaid Advertising, being a prepaid asset or operating expense account in standard accounting, would be created as a child of the appropriate Root account category. System accounts are pre-built accounts managed by Adaptive Planning for system-level calculations and cannot be user-created. Assumption accounts are reserved for global planning constants like rates and percentages. Contra accounts are used to offset balances in specific accounts (e.g., Accumulated Depreciation) and are a sub-classification, not a primary creation category. The correct workflow is to navigate to Modeling > Model Management > Accounts and create the new GL account under the appropriate Root. Reference: Workday Adaptive Planning --- Chart of Accounts, Root Account Structure, General Ledger Account Creation.