You can stitch and unstitch surfaces, reverse the normal direction, extend a face, and break or trim intersecting faces.
In the repair and construction environments, specialized commands help you analyze errors in imported surfaces and repair the data.
After making repairs, you can use the surfaces or solid bodies in the part environment. If the surface or solid has errors, you can still use the data in some operations.
After importing surfaces to the construction environment, you must promote the surfaces to the part environment before you can use them in parametric operations (or see the data in assemblies in Inventor).
If you selected Construction Group Mapping and deselected Auto Stitch and Promote during import, imported surfaces and wireframes are always placed in the construction environment, where you can analyze errors and repair the data .
Later, you can use the Stitch and Copy Object commands to promote selected surfaces or solid bodies to the part environment. Even if the surface or solid has errors, you may still be able to use the data in some operations.