Assign existing “feature” to epic

From Epics

1. Open the Epics item.
2. Click "Link to..." button under "Features" tab.
3. Select "Child" link type and enter the ID of the feature you'd like to assign to this Epic.

From Features

1. Set "Mapping" to "On" and you will see the Epics listed in the right panel.
2. Drag and drop the feature to the Epic you'd like to assign.

Or you can also:

1. Open the feature item.
2. Click "Link to..." button under "All Links" tab.
3. Set "Link Type" to "Parent" and enter the ID of the Epic you'd like to assign.

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https://stackoverflow.com/questions/34021920/is-there-a-way-to-assign-existing-feature-to-epic