The easiest way, is to hover your cursor over the tool you want explained, then press "F1" to run the "relative" help file.....but basically, it is exactly as described & illustrated below.
Design Manager Streetscape Limited
Solid Edge ST9 [MP8] Classic [x2 seats]
I posted two vids for this.
The first one shows how it can work and that you have to satisfy some conditions for it to work (like the flanges not overlapping to start)
The second one shows some way I would expect it to work and it does not.
These issues are way down on my list of problems with the software.
The first is: Need bend tables with back gage and stick out
The second is: I want tobe able to turn off changes to flat when bending.