I am working on scheduling a project and am not exactly sure on the dates of each task yet.  I have broken the project into many small tasks.  I have an estimate on how long each task will take.   I want to be able to

Instead of inputting a resource name or a qualtity of workers, I want to be able to assign a quantity of resource type  (like: programmer, or procurement specialist) by referencing the inputted manhours required for the task, and calculating it against the start and finish date for that task.
 

Is projectlibre capable of this?

I am working on scheduling a project and am not exactly sure on the dates of each task yet.  I have broken the project into many small tasks.  I have an estimate on how long each task will take. 

Since the tasks are controlled by the project deadline, I want to be able to assign a quantity of resource types (like: programmer) rather than assigning names.  I want to do this without overscheduling a resource by naming it too many times.