In QTP8.2 provide a facility to add repositories.

   when u installed qtp 8.2 software to show a option in 
Tools
 Merge object Repositories. Through U can add object Rep.

We can't merge Object Repositorys in 8.2
There is option in 9.0 only

In qtp9.0 we can merge only 2 shared OR's at a time
Precondition:first create 2 shared OR's(save as OR1.tsr & 
OR2.tsr)
for this we have to choose object repository manager(ORM) 

1.qtp menu-->resourses-->ORM
2.In ORM select Tools from menu-->merge option
3.After selecting merge u will get a dialog box
with 2 edit boxes-->enter the saved OR's names-->OK
4.Then the OR's will get merged

before merging if OR1.tsr has 3 test objects & OR2.tsr has 
5 test objects after merging you will find 8 test objects

Go to Repository menu item
Select Associate Repositories.
Then select the path of the repositories, you want to 
merge, from the dialog window & click on Add