If you want to publish a purchase requirement, in the main panel or in My Purchases, you will see a button that says "New publication". Fill in as much detail as possible in all fields (it is very important as the more data you provide, the better the Supplier User will understand) in field 1, press the "Add items" button (you can add up to 15 products per publication) in field 2 and then "Save" to make a publication effective.