The ‘if applicable’ means if you have it, provide it. Since you do not, you will not. What Amazon is looking for is a business license. Almost every wholesaler/supplier requires their customers to provide proof they are a business for tax purposes. This goes down when dealing with International entities however. A business license to Amazon shows you are an actual business and not just a hobbyist looking to make a few bucks.
So, what is a Business License? Business licenses are permits issued by government agencies that allow individuals or companies to conduct business within the government’s geographical jurisdiction. It is the authorization to start a business issued by the local government.
Business License is issued by your state’s department of revenue or equalization. Most require you to have your business registered with the IRS as well. This opens the door for you to purchase wholesale and direct from manufacturers to sell retail.
But as I stated, Amazon is asking for it if you have it. Since you do not, you do not supply it.