code editing in my front end shop script - repost 2

hello all, please read carefully before bidding. I won't even reply to bids with copy paste messages offering your services. I have a shop script in my main website to sell digital items. But I use a 3rd party shop (SPBAS) where all transactions and where the digital items are stored. When I add a new product in admin panel, there are a few fields (mandatory to add the item) which I don't need, like expiry and file selection. IMPORTANT: What I need is to remove the fields I don't need in the insert new product area of the admin panel, and add a new field which will allow me to insert the code for the buy now button of the 3rd party shop to direct the customer there. P.S. - DO NOT WASTE MY TIME! Bid only if you knwo you can do this, this was supposed to be done yesterday and the freelancer didn't have the skills to complete it. I WILL GIVE YOU NEGATIVE FEEDBACK