# Replace a Source or Destination Model

[](https://help.qlik.com/talend/en-US/talend-data-catalog/Content/user-guide/data-mapping/replace-a-source-or-destination-model.htm)

Data mappings are models of the underlying data flow in your architecture. As such, they are not rigidly connected to source or target models and they contain their own connection information internally. Thus, you may connect a mapping a different (but likely identical or nearly identical) model.

**Steps**

1. Sign in as a user with at least the **Metadata Editing** [capability object role assignment](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/administration-and-system-management/manage-object-roles.htm) on the Data Mapping you are going to edit.

2. [Navigate](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/explore/index.htm) to the [object page](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/analyze/object-page.htm) for the data mapping model.

3. Click to open the mapping to edit.

Replace with a new source

1. Go to the source (on the left) you wish to replace and click **Actions** > **Remove source**.

2. Click **Yes**.

3. Click to **Add Source**.

4. Pick an identical (at the column level) dataset (table, file, etc.).

Replace with a new target

1. Go to the target (on the right) you will replace and click **Actions** > **Replace target**.

2. Pick an identical (at the column level) dataset (table, file, etc.).

**Example**

Migrate to a new source

Open the **Adjustments to Staging** data mapping and open the **CustomerPayment** query mapping. Click **START EDITING** and right-click the Adj source (on the left) and select **Remove source**. Click **Yes** to confirm.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/data-mapping/img/image1017.png)

![](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/data-mapping/img/image1018.png)

Click **YES**.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/data-mapping/img/image1019.png)

Click **Save**.

Information note

Now, the source is no longer in the Mapping Editor tab.

However, the mappings and source connection definitions are still there and that is what we will reconnect to a new source.

Import a new **Adjustments2** model using the **Create Like Model** option on the existing **Adjustments** model. See [import a model](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/manage-metadata/create-a-model-and-import-metadata.htm).

![](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/data-mapping/img/image1020.png)

![](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/data-mapping/img/image1021.png)

![](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/data-mapping/img/image1022.png)

Then, returning to the data mapping and editing, click **Source+**, and pick the identical (at the column level) dataset (table, file, etc.) from the **Adjustments 2** model and click **Save**

![](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/data-mapping/img/image1023.png)

Click **OK**.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/data-mapping/img/image1024.png)

Information note

The mappings are now connected to the new source.

Replace with a new target

Open the **Adjustments to Staging** data mapping and open the CustomerPayment mapping. Click **START EDITING** and go to the target (on the right) and click **Actions** > **Replace target**.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/data-mapping/img/image1024.png)

Pick an identical (at the column level) dataset (table, file, etc.) **Staging DW 2** (create the modewl as above) and click **Save**.

Information note

The mappings are now connected to the new source.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/user-guide/data-mapping/img/image1024.png)