Sheet metal rip
The sheet metal Rip 
tool creates a rip on a sheet metal flange or removes a face.
You can use the Rip tool to modify a lofted flange to create an open flange that you can then unfold or create a flat pattern from.
The sheet metal Rip tool creates a rip on a sheet metal flange or removes a face.
You can use the Rip tool to modify a lofted flange to create an open flange that you can then unfold or create a flat pattern from.