You have the wrong name - what you describe is the flat pattern feature. An un-bend asks for a surface to remain stationary and the curved surfaces to unbend. There is a corresponding bend-back feature. Only the flat pattern feature jumps to the end of the model tree and forces new features ahead of it.
A Google search will turn up a number of Proe Sheetmetal videos and there is the PTC university training, some which is free and good. learningexchange.ptc.com