Timeline PRO has three mandatory fields that are required to successfully create a timeline chart. Click on each link to learn more.

• Date Hierarchy: Use the default Power BI date hierarchy; or stack multiple columns (one for each time unit) to build a custom hierarchy. Featured time units will be used as drill down levels.
• Date Value (X-Axis): Add a single column of datetime values. This data will be used to determine the X-axis placement of the adjacent Series values. Note: Datetime values in this field must be provided using the smallest time unit in your Date Hierarchy field.
• Series X (1-25): Add numerical values or measures for display on the Y-axis. Drag each column in its own Series field. You can display up to 25 series on the same visual and customize each series separately.

This visual also has two optional fields:

• Legend: Split Series values into visually distinct segments that can be displayed as stacks or clusters. 
• Tooltip Content: One or multiple columns of text/numerical values or measures that will be displayed in the tooltip when the user hovers over the data point.