Hi Trinetra,
Follow the link to create Transaction Iview to open in SAP GUI for Windows:
Create SAP Transaction iView using SAPGUI for Windows
And If you already have Portal iViews created, use the Multiple Property Replacement in Portal to change the Property "Selection of Application Variant".
Below is the link :
Multiple Property Replacement Wizard in NW 7.3x
Hope this helps.
Cheers-
Pramod