# Appending data source columns

This feature benefits you if you’re an Orbit Connect user, and wish to append extra columns to an existing data source. If you have already uploaded a file and wish to add columns, then you can do so via this process.

> [!NOTE]
>
> New columns may only be added if they are located to the right of the existing data source columns in the new upload file.

> [!NOTE]
>
> The steps below detail appending columns to a file upload, but the process applies to both file uploads and Amazon S3 based data sources.

To append additional columns to a file upload:

1. Open **Apteco Connect**, using the connect icon in the top right hand side of your screen.
2. Go to **Data Sources**.
3. On an existing data source, expand the option menu and click **Edit**.
4. Click **Select file**, and select your updated file.

   Once complete, a ‘New Columns Added’ information flag is displayed, stating which new columns have been added.
5. Click **Update**. Connect now removes all previous existing data and appends the new columns.
6. Now, go to **Data Mappings**.
7. On the corresponding Table Definition, open the options menu and click **Edit**.

   An information message is displayed stating that you have new variables available to add.
8. Click **\+ Add Variable**, select the relevant added columns, and click **Add**.
9. Add a **Data Definition** for the added columns.
10. Click **Save Table**.

    You’ve now appended the columns of an existing data source.