I would recommend you explore mapped Content Controls with an xml file.

If the fields are all populated in one place (same as a Mail Merge) then you could use that to create an xml file which then populates the contract docs as required. I would probably create a single template which contained all the suite of documents as building blocks. Each of those building blocks would include mapped CCs where relevant. Then as a user, you would create a new document, either replace the xml file or perhaps have an 'all fields' version for you to populate the XML fields which you do to fully populate the xml. Then for each different contract doc you can:
1. SaveAs to create a new doc
2. Select all and delete the content
3. Insert the Building Block you want - the fields will be already filled.

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Andrew Lockton
Chrysalis Design, Melbourne Australia