This interactive workflow modeller demonstrates a drag-and-drop interface for composing workload selections. Users arrange draggable items from an available pool into collection containers and target slots, with support for multi-selection, cloning, and collapsible or deletable groups. The interface relies on custom HTML elements, including `vc-dragcontainer`, `vc-dragitem`, and `vc-dragclosebutton`, which manage drag events, drop groups, and selection states. The code also includes save and restore functions for persisting connection configurations, with inline SVG graphics used within certain draggable items.