What exactly the term “Business Related Custom Features” in the Business Plan refers to ?

Business related custom features refers to, any essential features required for your business depending on the nature of your business. For e.g: For a travel agent, booking and reservation of hotel or flight is essential, similarly for a real estate agent, property listings are essential. Real estate features doesn't work for a travel agent, as it was not possible to mention all the features separately for various types of businesses, we mentioned it as "Business Related Custom Features", but not with the intention to create ambiguity in your mind.