Add columns one at a time to a finished Discovery. A new column is filled in across the rows you already have, and the answers in the other columns are kept — so you iterate without re-paying for what worked.
## What's in a Discovery
| Element | What it is |
| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Columns** | The questions. Each column has a label, an answer type — **Text**, **Yes/No**, **Number**, **Date**, **Currency** or **Bullet List** — and an optional prompt spelling out what to extract. |
| **Rows** | The documents Libra analyses. Each document becomes its own row, unless you deliberately fold several files into one. |
| **Cells** | The answer for one document–column pair, together with Libra's reasoning and its citations back into the document. |
| **Template** | A saved set of columns, so a Discovery you've tuned can be run again on the next set of files. |
A Discovery belongs to the project you create it in, and stays there: you'll find it again in the **Discoveries** folder under **Project files**, and in the Discovery list.
## When to use Discovery
