hierarchies with many attributes for each one

Hi everybody, I have an issue with modeling a "Project Management" business process.

Tipycally, each sub-task rolls up to a task and each task rolls up to a project.

sub-task have many attributes that need to be constarined by "Team Leaders".tasks and projects also do.

Shall I make a flattened dimension let's say "sub-task_dimension" whith all attributes for sub-tasks, tasks and projects.
Or shall I make separate dimensions(i.e: sub-task_dimension, task_dimension, project_dimension) and if so how can I "slice and dice" along sub-task, task and project attributes ?

Any help will be appriciated.

You have projects and you have tasks. Sub-tasks are tasks. Facts would reference the project and task. The task hierarchy is supported by a bridge table (exploded hierarchy).

Thanks ngalemmo for help. In fact I am planning to use SSAS and SSRS based on my dimensional model. Did they support the bridging technique for handling hierarchies?

It allows you to access all levels of the hierarchy using simple SQL. Should be fine for SSRS. I haven't worked with SSAS, you may need to build a flattened version of the hierarchy, which is easy enough to do using the bridge. Maybe someone in the forum more familiar with SSAS can comment.