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New sheet before the active one with the sorted history, a FORECAST.ETS forecast column, FORECAST.ETS.CONFINT lower/upper bounds, an optional FORECAST.ETS.STAT table, an Excel table over the data and a line or column chart. Parameters: timeline/values (default: the selection's first two columns), end or periods, confidence interval, seasonality, missing-point fill, duplicate aggregation, statistics, chart kind. Data ribbon button opens a form dialog; programmatic calls never do. gridcraft-functions exports Timeline to continue a timeline (numeric step or calendar months). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>