Best Website for a Store that several different organizations can order from with personalized links

I am in need of a website where I can load my store items, and schools and other organizations can shop under their own link or code to keep everyone separate. We have items we offer to schools, church’s, youth sports etc. for them to sell and get partial money from the sales back to their cause. It has been on paper and now we are going to several states so I really need it online. But can not for the life of me find what I am looking for. Does anyone have any guidance, suggestions, or even the possibly different verbiage for what I am trying to find. Thanks For the time and help