I need a reference document / technical design on how additional (complex / user defined) content types can be added (coded) into EP to meet user requirements. For example, one of the content types which may be supported in EP may be a multi-line text field with formatting capabilities. Now we may want to bundle 6 of these basic fields into a user defined content type and manage this as a single entity and offer it to content authors as an editorial content type. Can this be done and if so how ? If not, what is the way to realize this ?