Manufacturing > Mill Geometry > Mill Surfaces > To Merge Patches of a Mill Surface
  
To Merge Patches of a Mill Surface
When you create additional patches using Add, the added patches are not automatically included in the Mill surface definition. You must connect the patches with the base quilt (the one that includes the first added surface) by merging.
To access the Merge tool, click Mill Surface > Merge. Alternatively, click Model > Modifiers > Merge. Creo NC enables the Merge tool only if you select the two quilts that you want to merge.