using Enviromental variables

We can Parameterize the Object's properties of the OR. In 
the QTP 9.1 we have 2 types of OR (i.e. Object Repository). 
1. Local OR and 2. Shared OR. We cannot paramererize the 
Shared OR's Object properties. But we can Paremeterize the 
local OR's Object properties. We can use either Local 
dataTable or Global dataTable to paremeterize it. We have 
to select the datatable and then column name. We can use 
regular Expressions also.

In QTP 8.2, we can parameterize both the per-action OR and 
shared OR.
For Per-Action OR, we can parameterize in both the global 
sheet and local action sheets.
To do this, we can select the object in OR, and choose 
parameter radio button in configure value dialog, and 
choose global or current action sheet in parameter options.
If the OR is shared OR, here only global sheet option is 
visible and current action sheet is disabled.
To parameterize the OR follow below navigation:
Open the OR by tools-OR or OR button -> Select the object 
in OR or parent object -> Click parameter radio button and 
click -> click on the parameter options button beside the 
textbox ->select data table in parameter type list box -> 
choose the data sheet type and choose column name in the 
sheet

parametrization means transfering values or passing test 
data values from one action to another action / one test to 
another test. In Qtp we can parametrise datas by four 
methods:
1. Action parametrisation(from one action to another action)
2.Data table (same as action but data table is used for 
transfering datas)
3.Environment 
4.Random Numbers