How to get the child table records?

Hi All,

I can get the parent table record from child table record like

purchline.purchtable();

But, how to get the child record, in our case how to get the purchline for the selected purchid.

I am using below method

purchline localpurchline;

select * from localpurchline where localpurchline.purchid == purchtable.purchid;

Is there any other idea to get the child records for the selected parent record.

Thanks,

Hari