Creo Simulate > Getting Started with Creo Simulate > Operating Modes > Integrated Mode
  
Integrated Mode
Creo Simulate integrated incorporates simulation functionality into Creo Parametric to work in an integrated mode. In integrated mode, you create, analyze, and optimize your simulation model in the same user environment that you use to create your Creo Parametric geometry.
Modification and creation of units and systems of units is done in Creo Parametric.