Yes, it is possible to add a YTD (Year-to-Date) column next to the monthly columns in Tableau by creating a calculated field that uses a RUNNING_SUM function with appropriate filtering. You can compute the cumulative sum of Actual, Target, and Prior Year values from January up to the current month by using a calculation such as IF MONTH([Date]) <= MONTH(TODAY()) THEN RUNNING_SUM(SUM([Value])) END, ensuring the table calculation is set to compute across the month dimension. This calculated YTD value can then be added as an additional column beside your existing month columns by customizing the view or using a dummy field to label it as "YTD." This setup will give you a comprehensive performance snapshot with both monthly and cumulative data side by side, matching the layout shown in your screenshot.