Hi Devdathh,
I would recommend the following solution remove the export button from all three ALV and put a custom download button in the toolbar O|R a single Download button on your SCREEN PF-Status.
This will give centralized Download functionality as per your requirement.
For the download you already have all 3 tables.
Create a new table with single field as a character.
Data : begin of it_download,
line type c length 1024,
begin of it_download.
Now loop on all three tables and concatenate the entire contents of the table in single line
seperated by the horizontal tab and append it to the it_download table.
Once done download this table as XLS.
Regards