Questions regarding 'Group Parameters Under' section

[Anonymous]

What do they do?

Can I edit them? Can I create new ones? 

I've found surprisingly little information on this, and it's mostly old posts and thread. 

[RevitRx]

Group Parameters Under can be a helpful tool when creating clean and somewhat complex components. It can help keep similar parameters together. For example, whenever I have a formula for a parameter that a user can't change, I put it in the "Constraints" section.

Instance and Type Parameters:

Unfortunately, there's no readily available way create/modify these, although that would be incredibly helpful.

[Anonymous]

Thanks for the help. Much appreciated.