# Defining Tables and Columns
Use this guide to manually define tables and columns for line-item extraction in DocBits. This is especially useful when automatic detection doesn't fully capture the table structure, or when you need to add custom fields.
### 1. Access the Table Extraction View
Open your document in DocBits and click the **“Table Training”** button to enter the table extraction view.
### 2. Activate Training Mode
To manually define or modify tables and columns, click **“TRAINING MODE.”**
### 3. Define the Table Area
After entering Training Mode, you can define where the table is on the document. You have two options:
#### Option 1: Use Auto-Detect
Click the **“Auto-Detect Tables”** button to let DocBits try to identify the table area on its own.
If detection is successful, the table outline will be displayed automatically. You can then proceed to define the columns.
#### Option 2: Define Table Manually
If auto-detection fails or is inaccurate, you can manually define the table:
1. Click the **“Edit”** button to activate table selection mode.
2. Draw a rectangle around the table area on the left-hand document view.
### 4. Add and Define Columns
Once the tables are defined you can manually define the columns via the following button:\\
Define and sort the columns via drag and drop on the document. Repeat this for the tables on the other pages as well. As an alternative if the tables are equal on each page you can use the following button to use the same column for all tables defined in the document. This functionality copies the columns that you have defined to all other pages as well:
Use the **zoom** feature to better define columns on cluttered or complex documents, for example, when a lot of information is close together and this makes it difficult to define the columns:
If you defined a column by mistake it can be selected by clicking it and deleted via the following button:
**Note**: The button is only visible if the column is selected.
If you are done defining all tables and all columns on your document use the “Save” button to activate your changes and to extract the data from the document:
The data of all defined areas will be extracted and shown on the right side:
### 6. Save and Extract
Click **“Save Rules”** once all tables and columns have been defined.
* This tells DocBits where to find table data for this specific supplier.
* The next time a document from the same supplier is uploaded, DocBits will automatically extract the table using the saved rules.
**Note**: This training is supplier-specific. It will not apply to documents from other suppliers.
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://docs.docbits.com/administration-and-setup/setup/document-training/training-line-fields-table-training/defining-tables-and-columns.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.