Assembly Process Planning > Creating SimpReps, UDFs and BOMs > Guidelines for Working with a Large Design Assembly
  
Guidelines for Working with a Large Design Assembly
Keep the following guidelines in mind when working with a large design assembly:
Use simplified representations.
Retrieve the earliest step first to limit the number of components retrieved into memory. Only those components required for the process step are retrieved and displayed. All components of the design assembly are retrieved when adding a new step.
Set appropriate configuration options.