Pass variable value to different Web Templates??

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Hi BI gurus,

The scenario is: we have 2 web templates, and at the top of template A, there is Menu Item for the users to switch to template B. Time Variable: Fiscal_Qtr (a custom exit variable which by default set the value as Current Quarter) is being used in both templates. And, there is drop down box of Fiscal_Qtr in the layouts for the users to change when they do the planning.

The requirement is to keep the last value of the Fiscal Quarter when the users switch to different templates.

The difficulty is how to read the fiscal quarter from the buffer and pass the value when launch another template, because it is a totally new session. The new session always set to the default value.

Please share your thoughts if you have any experience about similar case.

Thanks a lot!

Eunice