Profit maximation remains the most important objective of business firms inspite of multiplicity of alternative businessdiscuss?

Your question is not clear. If you mean by multiplicity of alternative business that the business firm has several companies operating under one "umbrella", it doesn't change the fact that every segment of the business has to turn an acceptable profit in order to survive. The only exception that comes to mind is to have one business that shows a paper loss as a way to offset other profit centers for tax purposes.