You can use this tool to insert a drawing file as a XRef in a document.
XRef stands for eXternal Reference. An XRef is a file (this can be a drawing file, an NDW file or a DXF/DWG/DGN file) that is placed as a reference in a drawing file. The inserted file is still associated with the original file. In other words, the display in the drawing file will update to reflect any changes you make to the original file. An XRef is particularly appropriate for elements you use multiple times (e.g. hotel rooms).
