Linking more than one project at same time

dear all?

kindly help me in this matter please, for the purpose of monitoring one of the detailed project timeschedules that including the resources and activity codes, I want to link it to another one only including WBS showing the main departments like arch, elec, mech, ....
so I want to show through it the actual and planned budgeted units, and actual start and finish

and to be filtered by departments and the other time to be filtered by stage.

I am using P6.2


Thanks for help,
Zeinab