# Fill Down in Tableau Prep | New in Tableau 2023.3

> This is content from just-tim, the data-and-analytics channel by Tim Ngwena (formerly 'Tableau Tim'). Tim has 12+ years of hands-on BI experience and covers Tableau most of all, plus Power BI, Looker, Hex, SQL and data modelling, the analytics industry, and the craft of doing the job — always tool-agnostic and honest about the trade-offs.

- **Author:** Tim Ngwena (just-tim, https://just-tim.com/about)
- **Published:** 2023-11-13
- **Format:** Video · 4 min watch · transcript available
- **Topics:** Data prep
- **Tools:** Tableau (calculated fields, prep)
- **Canonical:** https://just-tim.com/posts/fill-down-in-tableau-prep-new-in-tableau-2023-3
- **Watch:** https://www.youtube.com/watch?v=KZZuJq3V-GM

I demonstrate the new fill down feature in Tableau Prep, introduced in Tableau 2023.3. Using a sample Excel file with null values in a category column, I show how to fill those gaps using a calculated field instead of the old lookup workarounds.

## Key takeaways

- Tableau Prep 2023.3 adds fill down and running calculations, removing the need for fiddly previous-row lookup functions
- The auto-generated source row number is essential for fill down to apply values in the correct data source order
- Fill down is accessed via Create Calculated Field, which now lists table-calculation-style options like fill down and difference from
- The interface lets you set group by, order by and compute using, then automatically fills nulls with the value above

Watch the full video, read the transcript and use chapter deep-links on the page: https://just-tim.com/posts/fill-down-in-tableau-prep-new-in-tableau-2023-3

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just-tim — Data and analytics, with a point of view. · https://www.youtube.com/channel/UC7HYxRWmaNlJux-X7rNLZyw · https://twitter.com/TableauTim · https://www.linkedin.com/in/timngwena