Mold Design and Casting > Verifying Models > About Draft
  
About Draft
If your reference part does not already have draft and shrinkage applied, you must apply these features before proceeding with your mold or cast model.
To check draft use one of the following commands:
On the Mold tab use the Draft command in the Analysis group.
On the Analysis tab use the Draft command in the Inspect Geometry group.
Parts with complex geometry typically require draft lines before you can create draft.