Imported surfaces
Imported surfaces must be promoted to the part environment before you can use them in parametric operations.
Workflows in construction environment
In the part browser, double-click the Construction folder to enter the construction environment. In the construction environment, specialized commands help you analyze errors in imported surfaces and repair the data. You can stitch and unstitch surfaces, reverse the normal direction, extend a face, and break or trim intersecting faces.
Later, you can use Stitch and Copy Object commands in the construction environment 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.