PO creation user problems

PO creation user problems

Is there any way that I can create a user that has the permission to be able to add in a new item when they create a purchase order? The only way I can do this is to make them an admin which I don't want to do. When I log in as the user and create a new PO I can select the vendor from the drop down but on the next screen I can only choose from existing items. When I am logged in as admin there is an extra button that lets me create a new item. Any help much appreciated.

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