we can add object repository at runtime

Two ways are there u can add

1. when u write below syntax in Action1

Syntax: RepositoriesCollection.Add(Path) 
Ex: RepositoriesCollection.Add(E:\OR\ObjRes.tsr) 

if write in Action1 it will automatically add the Object 
Respository to the Action1
(i.e Edit Menu-->Action-->Action Properties-->Associate 
Repository tab) at runtime.

no need to add the object repository before running.

2. Add the object repository at runtime by using AOM
(Automated Object Model)

Ex:
Dim qtAppn 
Dim qtObjRes 

Set qtAppn = CreateObject("QuickTest.Application") 
qtAppn.Launch
qtAppn.Visible = True 
 
qtApp.Open "E:\Test\Test2", False, False 
Set qtObjRes = qtApp.Test.Actions
("Login").ObjectRepositories 
 
qtObjRes.Add "E:\OR\ObjRes.tsr", 1 

The above example Add the Object Repository(ObjRes.tsr) to 
the "Login" action in Test2.

Here also no need to add the object repository in Test2.