It is not clear whether you are asking for help to define a new file in Adabas, or to populate a file using Natural.
From NaturalONE, click Help --> Software AG Designer Guides --> NaturalONE Help --> Natural Language for xxx --> Programming Guide --> Accessing Data in a Database --> Accessing Data in an Adabas Database. (Note that there are Natural Language manuals for several platforms.) Read sections Data Definition Modules - DDMs, Defining a Database View, and Statements for Database Access. Then ask specific questions.
Read the help text for DBA Workbench. Then ask specific questions on one of the Adabas forums. (This is a NaturalONE forum.)
Community members are willing to help, but we expect you to do your homework.
This is not a training site.