> For the complete documentation index, see [llms.txt](https://help.smallbuilder.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.smallbuilder.com/smallbuilder-line-items/builder/builder-setup-steps/setup-lookup-selector.md).

# Setup Lookup Selector

To register a line item, you first need to search for a lookup object, such as a product, select the desired record from the search results, and configure details like quantity to complete the registration. The lookup selector setup allows you to configure the layout of search results for lookup object queries.

<figure><img src="/files/Lo7gJDRa97UuCi577HKI" alt=""><figcaption></figcaption></figure>

<table><thead><tr><th width="100"></th><th></th></tr></thead><tbody><tr><td><strong>1</strong></td><td><a href="/pages/T6FELWs5DnZavvTyuzJ1"><strong>Configure Lookup Fields</strong><br></a>Add fields (columns) to display in the search results of the lookup selector and configure their properties. Additionally, you can add virtual columns to display data retrieved from DataSources.</td></tr><tr><td><strong>2</strong></td><td><a href="/pages/QVe1AqDX3PfrjO9zWgHb"><strong>DataSource</strong></a><br>If you want to display additional data beyond the lookup object records, you can use DataSources to fetch and display data from other objects. By utilizing Apex Classes, you can also implement complex logic or fetch data through external interfaces and display it in the lookup selector.</td></tr></tbody></table>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://help.smallbuilder.com/smallbuilder-line-items/builder/builder-setup-steps/setup-lookup-selector.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.