How can I add the multi-step forms using channels and uploading the data to database? And then perform searching on the same data. Also please suggest me that how booking process works for expression-engine ?
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I'd strongly suggest you look at purchasing Solspace Freeform Pro which can do something very similar but will be far easier to implement. It can handle multi-page forms, it stores the data to the database and has tags to retrieve. As an alternative there is also DevDemon Forms covering much the same thing.
Your second question: "Also please suggest me that how booking process works for expression-engine" - is too far ranging to be able to answer. There is no booking process in ExpressionEngine, EE is so flexible you can do whatever you need - it's a blank canvas. Your best approach would be to ask a new question providing much more specific detail on your requirements if you want to get a specific answer. If you want people to spend time and effort helping you with an answer, put some effort into the question.