I have been working with a long bridge with a SE transition. It is a little over 1,000 feet long and there are varying flange thicknesses along each girder. Each girder is different. In other words, that is a lot of data entry. OBM does not like something (not sure if it is the SE or other data that it does not like). It would be nice if the data could be retained even if an error is thrown. As it is now, if it won't create the girder, it throws the data out. Re-entering data can be a bit tedious.
You can copy and paste all beam definition information to an excel spreadsheet for safe keeping. You can also make changes there, then copy and paste those changes back to the beam definition window. I typically create a worksheet for the top flange, bottom flange and web.