how to change header value dynamiclly in procedural alv report?

Hi experts,

I develop one report (using procedural alv ).I gave 3 input check boxes (ex : in 1st checkbox 10days in 2nd check box 20 days

in 3rd check box 30 days they entered like this in the input checkboxes in days 10,20,30.In o/p report 3 columns i maintained like this . Column1 column2 column 3

from 0 to 10 days from 11 to 20 days from 21 to 30 days.

I want to display alv report o/p like this in the respective columns.

For example they enter 15 25 35 (i/p)

o//p in alv report

Column1 column2 column 3

from 0 to 15 days from 16 to 25 days from 26 to 35 days.

i want to change days dynamically in alv header .Pls give me the code using procedural alv report.

If u want i will give u detail.pls help me in this.