Make your document dynamic with Content Placeholders and add content to a document in the creation request. Decide what Content Library Items to add (different countries' terms & conditions, pricing tables with predefined currencies, additional fields or product information, etc.) to the document based on the data merged. In addition, you can prefill fields/variables values, add items to pricing tables, and assign recipients to roles from the specific Content Library Item.
See a detailed guide on how to use a content placeholder.
In addition, please review the documentation via the link.