Thank you for your answer. Mind guiding through the steps?

Have you installed a custom module before? I would need to know a little more about your setup. If you are using a web based version you should be able to just download the module from the link above, or by searching for it under Settings: Apps. Once you start to install it it will walk you through the plugin installation process as well, it's pretty easy. If you are hosting it, download the package above and place it in your /openerp/addons/ directory, then restart your server (/etc/init.d/openerp restart). Next go to Settings -> Update Module List. Then Settings -> Installed Modules, remove 'Installed' from the search, and install the module. If you don't see Update Module List, make sure Technical Features are enabled for your user account (under the Access Rights tab in Users). Once you get the module and OpenOffice plugin installed, create a new document and you will see the OpenERP menu appear at the top. From here select Modify Existing report, and you should be on your way. Let me know if that helps, or if you have other questions.

I have installed and configured openoffice. Which lines should i delete to achieve my requirements? The file: https://dl.dropboxusercontent.com/u/43632424/ledger.odt