Moves or extends the start position of the specified range or selection to the beginning of the nearest specified text unit. This method returns a Long that indicates the number of characters by which the range or selection was moved or extended. The method returns a negative number if the movement is backward through the document.
If the beginning of the specified range or selection is already at the beginning of the specified unit, this method doesn't move or extend the range or selection. For example, if the selection is at the beginning of a line, the following example returns 0 (zero) and doesn't change the selection.
char = Selection.StartOf(Unit:=wdLine, Extend:=wdMove)
The following arguments are optional
Extend - Specifies whether to move or extend the start of the range. If you use wdMove, both ends of the range or selection are moved to the beginning of the specified unit. If you use wdExtend, the beginning of the range or selection is extended to the beginning of the specified unit. The default value is wdMove