Hi, looney!
I'm afraid there's no easy way out.
Suppose you have 2 workbooks: A with 2 worksheets W1 & W2, where W1 has data and a chart, and W2 has the same chart but pointing to data in W1; B with a worksheet W0. If you copy W1 from A to B, you won't have any issue since W1 contains both the data and the chart, but if you copy W2 from A to B, when you open B being A closed you'd be prompted with the update source dialog since workbook B doesn't contains the data required for chart in worksheet W2.
Hope it helps.
Regards!