I'd rather wait for some more information on the question. Is the question about using agile methodologies to complete *any* task or is this question pertaining to some specific task? @Rashi Suryawanshi - could you add more details about your question?
In general, as @Alisha Tandon said, you will have to divide the entire the task or activity and break it into 'modules'. Each module will be owned by stakeholder who'll be responsible for completing the task in given amount of time.
As @saandeep sreerambatla said, MVP would be an ideal way to go if you are talking about releasing a software. Just focus on the features that are essential.
That said, more clarity is required about the requirement.
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