In Workday Adaptive Planning, Breakback is the feature that enables users to enter a value at a higher time stratum (such as a year column) and have the system automatically distribute that value proportionally across the lower-level time periods (months) within that year. When a user enters a value in the annual total column and triggers Breakback, Adaptive Planning allocates the annual amount to the individual months based on a defined distribution method — such as equal distribution, weighted by existing values, or following a seasonal pattern. This is the reverse of the standard bottom-up aggregation (where monthly values roll up to the year). Splits is used to distribute values across dimension values or account line items, not time periods. Copy Forward replicates values from one period to subsequent periods. Adjust applies a percentage or absolute change to existing values. Breakback is the specific, official term for top-down time period allocation in Adaptive Planning. Reference: Workday Adaptive Planning — Breakback, Standard Sheet Data Entry, Time Period Allocation.