Is it possible to use resouces of html template who’s i have purchase extended License will it be allowed
or it will fall under steeling category
no license (regular or extended) will give you permit to use other author work as a part of your product which will be selling. you must have to get written pemission from the original author.
You are licensed to use the Item to create one single End Product for yourself or for one client (a “single application”), and the End Product may be Sold.
end product mean website where you have used the purchased item to built the website for you or for your client. and for each individual end product (website) you have to purchase individual license. you should read license term clearly.
in case of extended license if you like to use any html to create for example a wordpress theme you have to get permission from the html author.
Are you seriously going to argue about stealing? If you are not capable of creating an original work then just move on, nothing to do for you unless you want to buy something.