Sheetmetal > Sheetmetal > Setting Up Sheetmetal Design > Fixed Geometry > To Define a Fixed Geometry Reference
To Define a Fixed Geometry Reference
1. Click File > Prepare > Model Properties. The Model Properties dialog box opens.
2. Under Sheetmetal, click change in the Fixed Geometry line. The Fixed Geometry dialog box opens.
3. Select a surface or edge as the fixed geometry reference for the part. The reference appears in the collector.
4. To flip the fixed geometry to the other side of the edge, click Flip.
* 
The Flip command is available only when an edge between two nontangent surfaces is selected as a reference.
5. Click Close.