Import/Export Web Items From Live


The Enterprise Portal of Production Environment is working fine because there is a default user page per user upon login. Now, I am importing Web Menu Items (URL) in the Development environment from Production Environment. I am new to EP, I know that it is possible to export/import Web Items, however, it seems that page definition of a certain user does not exists in the AOT. For example, I imported a Web Menu Items under URL (e.g. User1), if I check on its properties it has a URL value of Enterprise%20Portal/User1.aspx but I cannot find any User1.aspx under page definition. So for example, I try to visit the link below, it will work. Note, user1.aspx does not exists in the page definition. I'm stuck, need your help.