Generally Help views required when a view with outer join is needed as selection method of a search criteria. Means all the contents of the primary table of the help view will always display.
Go to SE11 and put view name and press create button.
Select the HELP VIEW option
Now add the description and table name
Navigate to the view flds tab
You can add more fields of that table.
Now in help view, you cannot add another table easily. Only tables that are linked with the primary table (indirectly) with a foreign key can be included in the view.
Now to check that, go to the tables tab and select the table and click relationship button.
We can see many tables that are linked to VBUK is displaying. Now we can choose any one of them.
We have selected VBRK table. And automatically join conditions are set.
We can also add more fields of 2nd table
Finally activate the view.
To use this Help view in a search help, just put the view name in the below place of a search help.
This F4 help will always fetch data from that view in runtime and display in result screen.