The Insert Parallel command inserts a parallel construct (also known as an AND construct or a concurrency) at the insertion point for an activity diagram or an EFFBD. This command is available either from the menu structure or by dragging the Parallel construct from the diagram palette to the desired insertion point.
If you insert by using the menu commands, CORE will insert based upon your current selection. If a node or construct is selected, CORE will insert before the selected object. If a branch is selected, CORE will insert at the end of the branch. If nothing is selected, CORE will insert at the end of the main branch.