Unless you create a fully custom solution (without DocumentTemplate from Mendix), I'm pretty sure you wont be able to achieve this.
Hi Nirmal: sounds like you've been very creative with your "Template Grid to display data and a static table to display header" approach - and as Nick says, you seem to be beyond the limits of what you can achieve with native Mendix.
Look in the App Store, search on the word "Word" and check out "Word Merging 4 Mendix" from Appronto and "Word Document Generation for Mendix" from Black Opal. You seem to work for ABN AMRO Clearing... I imagine the cost of the additional software licence required in either case should be within somebody's budget.