You cannot reorder sheet metal features to go below flat pattern1 in the featuremanager design tree.
Solidworks sheet metal dimension flatten.
Edge flange see figure 3 can be used to add an attached wall to any sheet metal body.
To flatten the entire part if the flat pattern1 feature is present unsuppress flat pattern1 or click flatten on the sheet metal toolbar.
Flatten surface is only available in solidworks premium and is really the last chance for a part to be flattened from a 3d shape in automated way.
In the featuremanager design tree select the part and click flatten sheet metal toolbar.
You flatten the entire sheet metal part by unsuppressing flat pattern1.
It is designed for materials like cloth or leather but can be used for metal if there will be forming involved.
Upholstery clothing even carbon fiber layups can be calculated using this feature.
To add features to the flattened sheet metal part you must first unsuppress flat pattern1.
To hide the bend lines expand flat pattern1 right click bend lines and select hide.
To flatten a body do one.
This same tool can be used to make a flat piece of sheet metal that one would use to add edge flanges and other useful sheet metal features.
The bend lines are shown by default when you unsuppress flat pattern1.
In the cut list right click the body and click flatten.
Options in basic sheet metal base flange tab.