Call one TF in other TF

Hi,
I have two taskflows... in each of the taskflow i have a default activity as home page
when i am running independently these taskflows initially home page gets displayed
But when i am calling the second taskflow in the first taskflow i want the home page not to be displayed again in the middle of the session
So my approach to this is to keep a router activity as default activity in the second taskflow and navigate to home page or some other page as the two options for router
But if i set some value in session scope in the first taskflow and before moving to second taskflow i want that session scope value to be set back to null so that router condition goes to another option and home page is not displayed.
How can we Reset the session scope value to null in the middle of taskflow or else can we have the value to be set in request scope so that while moving from one taskflow to other TF will the value of request scope be lost and set back to null , if this option works can somebody let me know how to set the value in request scope programatically.
Thanks,

try for view scope or page flow scope as request is to small and session is too big. Also you can have a method activity where you can still set it in session scope

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