Adding features for a content version
If you change the feature on a portal component or add a new component, and in either case the feature is not currently active in your custom content version, you must add that feature.
For example, say you created a custom content version to personalize a Customer Portal and you assigned the Default feature. Later you find that you need to create a new layout from scratch for this portal, and the layout should not be visible in any other portal. You can create the layout in your current content version, but the only way to see it on the Customer Portal website is to add and activate the Customer Portal feature in the content version.
To add a feature for a custom content version, the content version must be the editable originator.