Since there is not enough info about the chart type etc. Assuming that this
is a combination chart and you want to change the line color ie the color of
the line shown on the bars that creats a kind of graph depending up on the
source data.
Double click on the line and a format data series will appear then you can
edit the line colors as required.
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Click "Yes" if it helps
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Thanks
Suleman Peerzade