Approach to save Data

Hi All,

This is the screen which we are planning to build, and the user tries to enter the data on each and every subsection in the screen. However i wanted to understand which is the best approach to save the data.

Each tab in the left hand side will go into one table where these details if i am doing in process model, there might be more nodes. so i want to reduces the nodes and take the best approach. Could you please let me now which is the best approach.

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