sub-sections to organize projects

Is there a way to create sub-sections?
by example:

Section 1: Project Preparation
Section 1.1: People
Task 1.1.1: IT training
Task 1.1.2: Finance processes training

Section 2: Execution
Section 2.1: Infrastructure
Task 2.1.1: HW purchase & installation

Section 2.2: Software
Task 2.2.1: SW installation & configuration

Thanks for your answers and recommendations

3 posts were merged into an existing topic: Ability to add sub-sections