Window.SplitColumn Property (Excel)
Returns or sets the column number where the window is split into panes (the number of columns to the left of the split line). Read/write Long .
expression A variable that represents a Window object.
This example splits the window and leaves 1.5 columns to the left of the split line.
Workbooks("BOOK1.XLS").Worksheets("Sheet1").Activate ActiveWindow.SplitColumn = 1.5