Feature req: add a group call b , then add as subgroup in another b group.

[inevity]

Now we only have requirement relation between groups, But did not have the containing relation between both groups.
Now just workaround to expand a group to each skill in the b group.

[niyue]

I think introducing a more nested structure will make the graph more difficult to understand. The examples I follow are (and they don't use subgroup when modelling):

• https://hacks.mozilla.org/2018/10/webassemblys-post-mvp-future/
• https://en.wikipedia.org/wiki/Technology_tree
• https://lmgtfy.app/?q=skill+tree&t=i (skill tree in the games)

So far, I don't want to make the model/graph too complex to understand. I will keep this open to see if there is more feedback on this feature request.