Submit a batch job from ABAP program

Hi

My client's requirement is a selection screen so that user will select certain criteria.

Thereafter the program will select data from a table and dump it in a text file.

I got all this working ,but now the requirement is that after the selection was made by the user,the rest of the data extract and creating of text file must happen as a batch job .

How would I add this requirement ?

Many thanks

Gerhard