Changing Oracle out-of-the-box data model of invoice print template

Summary:

We have a requirement in the invoice print template to group and print the Bundle Name for lines with a bundle and just the product name for lines that are not part of a bundle. We have a flag that identifies if its a bundled product or not and so if the flag is 'Y' then we need to group and print the bundle name for lines with a bundle. We explored lot of options and the only option we understood to do is changing the data model itself to have it as a union where one query will have