The Renumber command is way to quickly change the Item Number of selected MEP Fabrication Parts.  It allows users to renumber elements based on a specified property, or renumber based on the order of selected elements. 

In Revit:

  • Navigate to the BIMrx tab >> BIMrx Fabrication panel >> Renumber command.

BIMrx opens up the Renumber Options dialog:

Group Options

Element Selection