Returns or sets the point where the trendline crosses the value axis. Read/write Double.
Setting this property sets the InterceptIsAuto property to False.
This example sets trendline one to cross the value axis at 5. The example should be run on a 2-D column chart that contains a single series with a trendline.
myChart.SeriesCollection(1).Trendlines(1).Intercept = 5