Create a libref to an existing SAS data library. Each row in the window can be used for defining a new variable. Type can be N for numeric and C for character. The default is numeric.
Length can be whatever is appropriate for the variable.
The default is 8. Label, Format and Informat again whatever is appropriate for the variable. Enter the command END and then hit the Enter-key on the keyboard to close the above window. Repeat this process until all the observations have been entered. To browser or edit the data set, this can be done rather easily using the Table Editor.