For the Pie chart there has been a bit of a back and forth in the highcharts forums. What I would do is get all of your data you need to plot and find out what percentage of the total all of that data is. Then, with the remaining percentage create another data point and set its color to grey. But you really have to consider what is the total percentage means - without further detail I cannot begin to guess.
As for the first question about "default grey bar under my column charts" it is not clear from that link what you mean. I do not really see what you mean with the charts I have looked at.
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