Hi,
Make sure you have the desired groups created in the AD
Log onto the project server using administrator
On the admin page select server configuration.
In the Active Directory page to synchronize type the name of the group
created in AD and has all the name of required resoruces.
Click on Update now.
This is one way other way is you can add resources mapping to the existing
role for that
Goto to manage users and groups on the admin page
Select the required group and say modify
Now enter the corresponding group name
Save these changes and then update it