As per the documentation of Splunk add-on for SQL server below
Configure database inputs using the Splunk DB Connect GUI
If you want to create a MS SQL Server database input, choose the template created for the Splunk Add-on for Microsoft SQL Server under the Template field of DB Connect.
We can create a db input based on the template. However, I have installed the Splunk add-on for SQL server on HF. But when I am trying to create a new db input using dbx3 app, I do not see any template in the drop down. How to get the SQL templates for dbinputs?