How to set Element security in TM1 at highest level?

[okh310]

Hello -

I have a Task Dimension consisting of the below.  If Contractor Y logs in, I want them to only see only their data.  I have granted them read access for their data.  Issue is when I enable drilling, the total project line is showing the total for all contracts (X + Y + Z).  I only want to show the total for Y.  I currently have the security set to READ to "read" for Contractor Y. 

I realize, the total project is really just a "number" in the TM1 model and it's not doing any on the fly calculations based on what you are running the report for.  BUT  Is there a way to limit the total project line to show only contractor Y total in TM1??

Total Project                               
   Contractor X                             
       Contract 1
          Subtask 1.1
   Contractor Y
       Contract 2
           Subtask 2.1
   Contractor Z
        Contract 3
           Subtask 3.1