# Creating an ID mapping workflow (rule-based)
<a name="create-id-mapping-workflow-procedure"></a>

After you've completed the [prerequisites](create-idmw-two-accounts-prerequisite.md), you can create one or more ID mapping workflows to use matching rules to translate first-party data from a source to a target.

**To create a rule-based ID mapping workflow across two AWS accounts**

1. Sign in to the AWS Management Console and open the AWS Entity Resolution console at [https://console.aws.amazon.com/entityresolution/](https://console.aws.amazon.com/entityresolution/).

1. In the left navigation pane, under **Workflows**, choose **ID mapping**.

1. On the **ID mapping workflows** page, in the upper right corner, choose **Create ID mapping workflow**.

1. For **Step 1: Specify ID mapping workflow details**, do the following.

   1. Enter an **ID mapping workflow name** and an optional **Description**.

      ![\[The Name and Description fields on the Specify ID mapping workflow details page\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/images/specify-ID-mapping-details-name.png)

   1. For the **ID mapping method**, choose **Rule-based**.

   1. (Optional) To process only new, updated, or deleted records in the workflow, select **Enable incremental processing**.

      ![\[The ID mapping section of the Specify ID mapping workflow page with the Enable incremental process checkbox selected.\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/images/id-mapping-method-enable-inc-proc.png)

      AWS Entity Resolution processes only new, updated, or deleted records in either the Source or Target ID namespace, rather than recreating the entire ID mapping table.

      When you choose incremental processing and your data table has a DELETE column, AWS Entity Resolution handles records differently based on the DELETE column value.
      + Records marked as `true` in the DELETE column are removed from the ID mapping table.
      + Records marked as `false` in the DELETE column are ingested into Amazon S3.

      If you leave this option unselected, AWS Entity Resolution runs the default batch processing ID mapping workflow on the ID mapping table. 

   1. (Optional) To enable **Tags** for the resource, choose **Add new tag**, and then enter the **Key** and **Value** pair.

   1. Choose **Next**.

1. For **Step 2: Specify source and target**, do the following.

   1. Turn on **Advanced options**.

   1. For **Source**, choose **Matching workflow**, and then select the existing **Matching workflow** from the dropdown list.

   1. For **Target**, choose **Matching workflow**, and then select the existing **Matching workflow** from the dropdown list.

   1. For **Rule parameters**, specify the **Rule controls** by choosing whether a **Source** or a **Target** can provide rules in an ID mapping workflow.

      Rule controls must be compatible between the source and the target to be used in an ID mapping workflow. For example, if a source ID namespace limits rules to the target but the target ID namespace limits rules to the source, this results in an error.

   1. For **Comparison and matching parameters**, do the following.

      1. Specify the **Comparison type** by choosing an option based on your goal.    
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/create-id-mapping-workflow-procedure.html)

      1. Specify the **Record matching type** by choosing an option based on your goal.    
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/create-id-mapping-workflow-procedure.html)
**Note**  
You must specify compatible limitations for the source and target ID namespaces.

   1. To specify the **Service access** permissions, choose an option and take the recommended action.

      ![\[The Service access options on the Specify source and target page\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/images/specify-source-target-service-access.PNG)    
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/create-id-mapping-workflow-procedure.html)

1. Choose **Next**.

1. For **Step 3: Specify data output location – *optional***, do the following.

   1. For **Data output destination**, do the following.

      1. Choose the **Amazon S3 location** for the data output.

      1. For **Encryption**, if you choose to **Customize encryption settings**, then enter the **AWS KMS key** ARN or choose **Create an AWS KMS key**.

   1. View the **LiveRamp generated output**.

   1. Choose **Next**.

1. For **Step 4: Review and create**, do the following.

   1. Review the selections that you made for the previous steps and edit them if necessary.

   1. Choose **Create**.

      A message appears, indicating that the ID mapping workflow has been created.

After you create the ID mapping workflow, you're ready to [run an ID mapping workflow](run-id-mapping-workflow.md).