In a part made of uniform thickness, click Insert
Bends 
on the Sheet Metal toolbar, or click Insert, Sheet
Metal, Bends.
The Bends PropertyManager appears.
Under Bend Parameters, do the following:
The Bends PropertyManager allows you to create a sheet metal part. When you use the Insert Bends tool, you must create a solid body, then use Insert Bends to convert the part to sheet metal. Alternatively, you can create a part directly out of sheet metal with a Base-Flange.
To convert a part to sheet metal:
In a part made of uniform thickness, click Insert
Bends on the Sheet Metal toolbar, or click Insert, Sheet
Metal, Bends.
The Bends PropertyManager appears.
Under Bend Parameters, do the following:
Select a Fixed
Face or Edge 
.
Set the Bend
Radius 
.
Under Bend Allowance, select from the following options: Bend Table, K-Factor, Bend Allowance, or Bend Deduction.
If you selected K-Factor, Bend Allowance, or Bend Deduction, type a value.
If you want relief cuts added automatically, select the Auto Relief check box, then select the type of relief cut. If you select Rectangular or Obround, then you must specify a Relief Ratio.
If
desired, select an edge to rip under Rip
Parameters 
,
and do the following:.
Click Change Direction if you want to reverse the direction of the rip.
Clear
the Use default gap check box if you want to set a gap distance,
and type the value in the Rip
Gap 
box.
Click OK 
.
The bends are added, and the part is converted to sheet metal.