Vishal,
Well, I don't really understand the details of your macro, but the underlying data that is manipulated by a Macro is not specific to a planning book, it is specific to the planning area. All Macros that make changes to data write their changes to the planning area, not to the planning book. So, your custom report, once you find a way to write it, would eventually do no differently than what your Background job is currently doing.
You can limit the scope of changes that are executed by a Macro by use of special Selections and special DataViews. However, these will still write the changes to the Planning Area.
It is sometimes helpful to create new KeyFigures in a Planning Area, that are not displayed in any Planning book, but are used to facilitate the manipulation of data contained in a report.
Best Regards,
DB49