Move and Copy a mullion

The below example illustrates how a copy tool functions.

To Move and Copy a mullion, highlight the mullion, and activate the middle edit handle. The mini toolbar opens.
Select the tool, e.g. Copy, and drag the cursor along the panel. You can move the cursor within the adjacent panel.
When done, click to select the data point. The current mullion is copied into next panel cell where data point is defined.

The resultant panel then will have split mullion panels.