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Hi Ben,
Based on your description, you would like to create an external column in SharePoint site. I suggest you follow the steps below.
1. Go to a list and create a column.
2. Input a column name and select External Data in the Create Column form.
3. Select an External Data Source in the External Content Type session.
4. Click the OK button after making your selection.
5. Select the columns to show from the list.
6. After creating the External Column, you will see the columns which you selected.
7. Click New Item, go to External Column, and select an item in data source to show.
8. When you return to the list, you will see it populated with data.
Regards,
Yoga