Before selecting grids to copy for monitoring, specify the following parameter values on the Copy/Monitor Options dialog. 
See 
  Specify Options for Copy/Monitor and 
  Copy Elements for Monitoring. 
Note: You cannot use the Copy/Monitor tool to monitor and coordinate changes to 
		
multi-segment grids (that is, grids whose grid lines are composed of multiple segments). 
	 
 
 Reuse grids with the same name
 
   
  When you select this option, if the current model contains a grid line with the same name as a grid line in the linked model, a new grid line is not created. Instead, the existing grid line in the current model is moved to match the location of the grid line in the linked model, and monitoring is established between these grid lines. 
  
 
 
Reuse matching grids
 
   
  Select one of the following values: 
  
 
  -  
		Don’t reuse: Creates a copy of a grid line, even if the current model already contains a grid line at the same location. 
	 
 
-  
		Reuse if Elements match exactly: If the current model contains a grid line that occurs at the same location as a grid line in the linked model, the grid line in the linked model is not copied. Instead, 
		Revit creates a relationship between these grid lines in the current model and the linked model. 
	 
 
 
 
Add suffix to grid name
 
   
  Enter a suffix to add to the names of copied grids. 
  
 
 
Add prefix to grid name
 
   
  Enter a prefix to add to the names of copied grids.