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# Add a dashboard page that reads another table

> Build a Mammoth dashboard on up to 5 tables: add a page that reads another table, check row security and filters, and see what multi-table boards can't do.
>
> Applies to: Roles: Anyone who can edit the dashboard. Where: Dashboard editor › Data › New page from another table

A dashboard can read up to 5 tables from the same project. Each page reads one table, and every chart on that page reads it. A chart never reads two tables: to combine tables in one chart, join them in the data editor or a pipeline first (see [Join two datasets on a shared column](https://mammoth.io/docs/learn/clean-and-shape/join/)).

## Start a page on another table

Start from any of these. They appear only for the Dashboard format, on a saved dashboard.

- **Data** tab → **New page from another table** ("Every chart on the new page reads that table."). See [See the data behind a dashboard](https://mammoth.io/docs/learn/dashboards/dashboard-data/).
- **Add** → **Page** → **On another table? Choose the table it reads →**.
- On a dashboard that already reads more than one table, **Add** → **Page** says "This dashboard reads more than one table" and the button reads **Choose a table**.

## Set up the new page

The **New page** panel has these controls:

| Control | What it does |
| --- | --- |
| **Page name** | Defaults to the table's name. |
| **This page reads** | The tables in the dashboard's project, with **Search tables**. Tables already in use show which pages read them; the dashboard's original table shows **This board's table**. |
| **Row security** | Shows only when row-level security is on, with the security column's name, for example **Row security · Region**. Tells you whether the table **has it** or is **missing** the security column. If it's missing, you get links to open that table's pipeline (for example **Open Orders pipeline**) and **Row security settings**. |
| **Filters on every page** | Shows whether each dashboard filter **covers this page too** or **stays on the other pages**. **Date uses** picks this page's date column. A filter covers every page when every page's table has that column, with the same name and type. |
| **Start with** | **A suggested layout** (built from the table's columns, with a preview) or **A blank page**. |

Click **Create page**. You see a message such as "Added Returns, reading Orders."

## Messages when adding a page on another table

| Message | What to do |
| --- | --- |
| "This board already reads 5 tables, the most a board can read. Pick a table it already reads, or combine tables in the data editor first." | Pick a table already in use, or combine tables first. |
| "This table belongs to a different project than the dashboard. Pick a table from the dashboard's project." | Pick a table from the same project. |
| "Orders has no Region column, so this page can't be added while row security is on. Add the column in its pipeline, or turn row security off." | Add the security column in that table's pipeline, or turn row security off. |
| "Orders has no date column, so the date filter won't cover this page." | Expect the date filter to skip this page, or add a date column. |
| "No other tables yet. Add data in the Data library, then come back." | Add data first. See [Choose how to bring data in](https://mammoth.io/docs/learn/get-data-in/). |

## What a dashboard on several tables can't do yet

A dashboard that reads more than one table:

- Can only be copied within its own project.
- Can't be saved as a template.
- Can't be exported to Power BI or Tableau.

To do any of these, use a dashboard that reads one table, or combine the tables in the data editor first. See [Manage your dashboards](https://mammoth.io/docs/learn/dashboards/manage/).

## Limits

- Up to 5 tables per dashboard, all from the dashboard's project. Each page reads one table.

## Related

- [Add pages to a dashboard](https://mammoth.io/docs/learn/dashboards/pages/): page types and navigation.
- [See the data behind a dashboard](https://mammoth.io/docs/learn/dashboards/dashboard-data/): the tables each page reads.
- [Change a dashboard's data or copy it](https://mammoth.io/docs/learn/dashboards/change-data-and-export/): copy and export rules for multi-table boards.
- [Join two datasets on a shared column](https://mammoth.io/docs/learn/clean-and-shape/join/): combine tables instead.

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Source: https://mammoth.io/docs/learn/dashboards/multi-table-pages.md · Updated: 2026-11-08