delete entries from ztable

we are having a ztable. now our requirement is to delete entries in the ztable through

the zreport.

in the selection screen we give the material num and date(which is stored in the field of a ztable)

based on this we need to delete the entries.

please tell me how to do this , either we need to have internal table or directly delete the

ztable,

in selection screen we declared the parameter of int i . so user can give 4 or 5 or 10 .

means if he gives 10 it means sydate-10 days before. before 10 days data should be deleted

and after 10 days data to till date should be kept in the table.

so please give me a sample code .so tell me the best way to achieve this.

Thank you for all the replies.