To support a successful sales team transition when restructuring sales teams to align with product lines, the consultant should meet with territory sales leadership to design territory assignment rules. Territory management ensures that sales reps are assigned to the correct accounts and territories based on the new structure. Designing territory assignment rules will help in automatically assigning the right accounts to the appropriate sales reps, streamlining the transition and ensuring that each sales rep focuses on the accounts they have been assigned. Salesforce's Territory Management functionality provides a robust framework for managing and assigning territories efficiently.