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B_BajajB_Bajaj 

How to save data of child pages added as <apex:include> in single click (function) from parent page.

I have requirement where we are showing multiple pages in a sinlge parent page which has just <apex:include> which will looks something like below:
User-added image

User will have one edit button which should redirect him to input mode across all the pages/tabs. He can make the changes and he needs to click a save button on the parent page which will save all data across all the objects (approx 8-9 objects) in backhand. 

I have started the development of each page in parallel keeping the common controller to meet the deadline but at this moment main roadblock is "How to Save across all the tabs". I am not able to retain the values entered under each tab for different objects (each page) when trying access them in parent page.