To apply product-specific prices from a service contract to a service order:

Maintain price agreements: Price agreements in the contract (e.g., condition type PR00) define product-specific prices, which are copied to linked service orders during creation or item entry.

Maintain billing plan: Controls billing timing, not pricing.

Maintain contract price: A general term, not a specific mechanism.

Maintain price lists: Used in sales, not contract-specific pricing in service.This is part of pricing condition configuration in scope item 3MO."Price agreements in the service contract ensure product-specific prices are applied to service orders." (SAP Help Portal, Service Pricing).