phpprobid v7 bulk import items via csv or xls. Multiseller website.

Hello, I need someone who has some experience in phpprobid software if not then someone professional. I have a multivendor website and its software is phpprobid. The version im currently using is the latest V7 and the older mods do not work with it. I need a bulk lister or a listing importer expoerter for each seller user. I need these things: 1) Multi vendor website so each seller should be able to import their own items. 2) It needs to have a csv file importer and excel file must have a dropdown for several options like categories etc. 3) Every category has its own custom filters so excel file must have solution for that. 4) It must show error for the missing fields and telling the user which mistake should be corrected. 5) A test user login will be given so you can check the categories and all the unique filters according to categories they have. NOTE: Only serious workers who understand the work already will be given preference. Fake bids will not be appreciated. I will create milestones and release them on progress only. If failed to d oprohjext on time i will cancel all milestones. Sorry but i have had my loss before. If this work is completed nicely ill give tons more works lined up for it. This is like a test work to hire someone professional. Bid so we can discuss more details.