Then what are the different ways we can use Date directly, both as numeric and also alphanumeric and what is it's defult data type?
Say for example some value being moved into Date.
Also, i would appreciate to know a case where the elementary items are both numeric and alphanumeric then what will be the default data type of the group level element. Plaese let me know it's usage with example.
There is a link to the manuals at the top of the page. Click on it, find the COBOL Language Reference manual, and read section 188.8.131.52 to find out what type of data groups are considered in COBOL. You can also find out -- in this very same manual -- exactly what types of moves for this data type are supported (both to and from the group). I'll leave finding that section as an exercise for you.