Hi,

You might try your local support team who could put you in touch with Expert Services. Expert services might have a playbook. 

There is the DMT - Sage Data Migration Tool Subscription.(Log on to Sage University to access). Here are the details:

"The Data Migration Tool (DMT) is used for new implementations, new company implementations, and for routine imports. DMT will help streamline and reduce the time to import customer data. 

"The Data Migration Tool Subscription* provides access to the Data Migration Tool and a library of import templates to be used throughout your implementation. This subscription also includes community forums to share, access and discuss best practices and provide feedback with your peers. This feedback will contribute towards the continuous improvement of the toolkit and methodology."

Regards.

Pam