expression.NumberOfColumns
expression Required. An expression that an Index object.
Remarks
Specifying 0 (zero) sets the number of columns in the index to the same number as in the document.
Example
This example sets the number of columns in the first index to the same number as in the active document.
ActiveDocument.Indexes(1).NumberOfColumns = 0
This example sets a two-column format for each index in the active document.
For Each myIndex In ActiveDocument.Indexes
myIndex.NumberOfColumns = 2
Next myIndex