How to Pass Data from One Page and Save the Data to a BO in another Page

Summary:

We have a requirement where we are entering the Id Number in First Page and then selecting a field relevant to the Id number from second page from LOV and then going to the thirds Page and entering some more details for that Id number . Then we need to save the data to the BO in the 3rd Page. But the data is not getting saved after coming to the 3rd page. How to achieve this?

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