Series.Trendlines (Excel)

Returns an trendlines that represents a single trendline (a Trendline) or a collection of all the trendlines (a Trendlines collection) for the series.

Trendlines (Index)

Index: The name or number of the trendline.

Dim trns As Trendlines
Set trns = ActiveChart.FullSeriesCollection(1).Trendlines()