How the data is fetched from question_answer table in Incident form in variable tab? can I create my own table and populate the table instead of getting it from question_answer table ?

[Prithivirajan1]

[Justin77]

Yes you can!  That variable editor at the form level is a UI Formatter:

[instance_uri].service-now.com/nav_to.do?uri=sys_ui_formatter.do?sys_id=86863af2c611229101b57dcc29ac7666

UI Formatters are kind of like wrapper classes for UI Macros, and allow for them to be inserted into forms.  You can see this by clicking the "View UI Macro for this Formatter" Related Link in the UI Formatter record.  You can clone each of those (the UI Formatter and the UI Macro) and with the UI Macro you have the freedom to pull in any table data you require.