ドキュメントサイズの変更

[JavaScript]

var myDoc = app.activeDocument;
myDoc.documentPreferences.pageWidth = "150mm";
myDoc.documentPreferences.pageHeight = "150mm";

[VBScript]

Set app = CreateObject("InDesign.Application")
Set myDoc = app.ActiveDocument
myDoc.documentPreferences.pageWidth = "150mm"
myDoc.documentPreferences.pageHeight = "150mm"

例)縦横150mm