I have the flat pattern and a drawing of the bent sheet piece that I need. I'm coming across the issue that bend deductions were accounted for in the flat and that when I bend the flat pattern to try and achieve the bent piece that my dimensions are off from the drawing (they are all under, so I'm pretty sure this is a k factor thing from the original file). Without recreating the bent piece (I'd like to work from the flat backwards) first, how can I account for this?
Change k-factor in your sheetmetal setting until you get the right size after bend.
Also you need to know bend radius of all the bends.