You create offers using the offer templates available to you in Campaign. These templates will already have been created by a system or offers administrator. Each offer template has a security policy that determines who can access and use the template; you can only see offer templates to which you have access.
New offer templates can be added at any time, and there is no limit to the number of templates defined in Campaign. The template is an inherent attribute of the offers created from it, so you can search for offers using the template as a search criterion.