It is important to ensure that the additional documents comply with the specific requirements and format set by the immigration service. Typically, immigration authorities have certain rules and structures for providing additional documents.
If you are not allowed to include a client information section in additional documents, then you should follow these rules. If you are in doubt or have questions, it is best to consult with an immigration attorney or immigration official to ensure that your documents and applications are appropriate and do not violate the processing rules for your case.