Copy waveform chart from subvi to main vi.
Create output node in subvi linking subvi's waveform graph (On front panel, right click vi icon and Show Connector, while still on front panel of subvi use wire tool and select graph then click a connector).
On main vi diagram, connect copy of graph to newly created output node of subvi.
Print out labview users manual and read it.
2006 Ultimate LabVIEW G-eek.