https://forums.autodesk.com/t5/autocad-forum/creating-large-3d-model-of-distribution-system/m-p/5505770#M340248 <P>With out knowing more about what you need or want to do I suggect<A href="http://www.autodesk.com/suites/infrastructure-design-suite/overview" target="_blank"> this</A>&nbsp;. Works with most ESRI files and most other types of GIS formats. Does have limits like all software but may suit you needs. &nbsp;</P> Thu, 12 Feb 2015 23:53:16 GMT Murph_Map 2015-02-12T23:53:16Z