> For the complete documentation index, see [llms.txt](https://doc.wearepatchworks.com/product-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.wearepatchworks.com/product-documentation/process-flows/cross-reference-lookups/installing-cross-reference-lookups.md).
# Installing cross-reference lookups
## Introduction
Before a standard Patchworks **cross-reference lookup** can be [applied in field mapping transformations](/product-documentation/process-flows/cross-reference-lookups/using-a-cross-reference-lookup-in-field-transformations.md), it must be installed. Follow the steps below to complete this task.
## The steps
Show me
**Step 1**\
Log into the Patchworks dashboard, then select **process flows** \~ **cross reference lookups** from the left-hand navigation bar.
**Step 2**\
Move down to the **marketplace** section and find the cross reference lookup that you want to install - you can use the search field or step through pages to find your required item. For example:
**Step 3**\
Click the **install** button associated with the cross-reference lookup that you want to use. The item is installed and added to your **installed** section at the top of the page. This cross-reference lookup is now [ready for use](/product-documentation/process-flows/cross-reference-lookups/using-a-cross-reference-lookup-in-field-transformations.md).
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