how to initiate from 3rd script

[KavitaPriyaCR]

If you are talking about scripts, then it can be done like:
Write .vbs file where you will have a function to execute the scripts by launching the qtp.
EX:

Code:

If (Condition1) Then
ExecuteScript "Path\script1"
Else
   If (Condition2) Then
     ExecuteScript "Path\script2"
   End If
End If
Public sub ExecuteScript(ScriptPath)
..
..
..
End Sub

Now run this vbs file.