search help in output(using alvgrid function module)

HEllo Experts,

I hav developed report using ALV grid function module, now my req is I need to provide the search help for particular field in the output.

my output contains .MATNO, PLANT AND STORAGE LOCATION.

Now based on mat and plant I need to provide the F4 help for storage location field in the out put.

could u pls anbody help me on the req asap. with details code.

will give u Full point if it suits my req....