A dual-mode GUI (600) is disclosed which includes a source timeline (614) and a manual editing timeline (606) within a common editing window (608). This arrangement enables the user to maintain a contextual appreciation of relationships (618) between a parent clip (616) and a related child segment (602) throughout an iterative editing process (1000). Using a dual-mode approach, after the user has performed auto-editing using an auto-edit GUI (1200), the user then activates the dual-mode GUI (600), in order to proceed with additional manual editing (1000).