Columns.PreferredWidthType Property (Word)
Returns or sets the preferred unit of measurement to use for the width of the specified cells, columns, or table. Read/write WdPreferredWidthType.
Syntax
expression .PreferredWidthType
expression Required. A variable that represents a Columns collection.
Example
This example sets Microsoft Word to accept widths as a percentage of window width, and then it sets the width of all columns in the first table in the active document to 50% of the window width.
With ActiveDocument.Tables(1).Columns
.PreferredWidthType = wdPreferredWidthPercent
.PreferredWidth = 50
End With