Add/edit content to Content Center

[machiel.veldkamp]

So a few years back I edited some stuff at my previous workplace in their content center.
I know it was a hell of a job and I'd like to do it again. BUT I FORGOT HOW.

So What I want to do is:
- copy some DIN UNP/IPE/HEA etc. profiles and edit the material to 1.4301 Stainless steel

- Create a way to use these in the frame generator.

I'm using Inventor 2012. 

Can anyone point me in the right direction? I can't find the help I got before and there's not really a lot of support from Autodesk and I kinda need it.