InfoPath allows us to create data connections and fetch values from any SharePoint list. We can also select which column values we want to select. The data connection will then return all the items within the list, to control which value(s) we want to fetch, we can apply filters.
filters Click on the Dropdown properties and select/add a Data connection. In the Entries field, click the XPath selector button which will enable us to select which column value we want to bind to the dropdown control.
Select the parent node and click on Filter Data… to bring up the filter choices
Click on the Dropdown properties
Select the datasource from the Data source dropdown or you can create one here as well. Then click on the Select XPath button (highlighted in the image).
In the Entries field, select the parent node and click OK.
This will enable you to select two different values for the Value and the Display Name field.
Now from the returning values, select the ones you want for each field and save your form.
To view your changes, you may want to publish the form and verify the changes.