Task dependencies let you establish logical connections between tasks and easily change timeline for all tasks by simply changing start/end date for any task where dependency is established.
Tasks can be created in side workgroups (projects). You decide who gets access to specific projects/workgroups and what participant roles are.
Bitrix24 comes with a wealth of collaboration tools that your project managers are sure to appreciate. More importantly, you can track project progress and participate via your iOS and Android based smartphone.