You can add bend lines to the sheet metal part while the part is in its folded state with a sketched bend feature. This allows you to dimension the bend line to other folded-up geometry.
Some items to note about a sketched bend feature:
- Only lines are allowed in the sketch. You can add more than one line per sketch.
- The bend line does not have to be the exact length of the faces you are bending.
A sketched bend feature is commonly used with a tab feature to bend the tab.