Project Server 2010 PSI (WCF) Project Cost and Project Work

I am new to PSI. I need to retrieve details about a specific project from PS 2010 using PSI (WCF).

I am able to pull most of the metadata (fields/properties) info  I needed except the "Project Cost" , "Project Work"

I need to retrieve:

1.  cost of the project to date

2. Total Project  hours (Work)

3. Project hours (Work) to date

Any help please...

Sai