HI Vamsee,
How are you !
When you open the work book don't save as varient. there you might find the option called, change prompt option.
1. Open the prompting dialog in the required mode. 2. Select the variant in the drop-down list. 3. Change the prompt values for the variant. 4. Press the save icon. The variant is saved with the new defined prompt values. If you want to change the variant name, go to the variant settings dialog.
Please read prompt section in below URL:
http://help.sap.com/businessobject/product_guides/AMS14/en/14_aaoffice_user_en.pdf
4.2 Prompting
I feel this information might useful for your query.
;If this not work...I am assuming like, you can create one more button like refreh, whenever you open planning workbook freshly, open the varible prompt screen freshly.
Regards,
Satya.
9036889499.