There are two ways to do this in the GUI:
The hidden skip points feature In Plot Details dialog, at the Dataset level, on the (inexplicably) Drop Lines tab, you will find just what you want. (This only works for Scatter plots. For Line+Symbol plots, it's available, but only works on the Symbols.)
For all other plot types, you can:
Turn on Speed Mode In Plot Details dialog, at the Layer level, on the Size/Speed tab, you can check the "Worksheet data, maximum points per curve" and enter a value to use. This can be calculated by: Value = TotalPointsInData / SkipPoints
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