By organizing a workshop with project stakeholders to define the detailed requirements for project outputs, the team manager is applying the PRINCE2 principle of "Focus on Products." This principle emphasizes that a project's primary focus should be on product definition, delivery, and quality requirements, which are crucial for achieving project success and user satisfaction.References: (PRINCE2 7 Foundation Handbook, AXELOS)

In the 'planning' technique, a team manager should break down the cost of delivering a work package during the 'Preparing estimates' step. This involves estimating the resources and time required to deliver each component of the work package, which are critical for budgeting and resource allocation. References:
PRINCE2 Foundation course material on planning techniques and project management documentation.