Hi DNJ.
Select a style first then press the digital recording button then style creator lcd button. I think you then select the section and part you want to create. I can remember where it says assembly, this lets you combine the styles elements then you can use these to create your own new styles. I've not created any new ones for a while and I'm not in front of my T2 now, but it does tell you this in the instruction book under style creator heading.
Hope that helps, it's quite easy once you've tried it and you can get some good styles going off