I assume that you want to plot the same columns (on the new sheet) in the same format, etc., and this is why you're copying the chart?
one option:
right-click the tab at the bottom of the source sheet for the chart (whichever sheet has the chart you want to copy). Use "move or copy" to make a copy of that sheet. Copy the data from the target sheet over the top of the data in your "copy of" sheet, so that the chart has the data that you want. Delete the target sheet, and rename the "copy of" sheet to take its place.
