Jakub Trznadel Wrote:I am still confused about idea of element in two groups... do you have some real example of it to share?Well you might need it when you want to make multiple animations using the same model, where each animation needs a completely different set of groups (whom can have overlap).
Groups will also probably overlap when you want to create a motion animation and a building instructions animation using the same mpd/ldr tree. e.g. a steering arm and it's wheel etc (BI sub assemblage), which will be a single group in the BI but multiple ones when you want to animate the steering mechanics.