Sometimes you want to go back in your design and maybe even insert a new feature at that earlier stage.

What i used to do was to go to my operations tree (or feature tree if you like) and then change the modeling stage there.
But what i didn´t know was that in TopSolid 7 you can just as easily do the same thing using on the contextual menu which is only as far away as a touch of a button!

Edit: And of course as S Gasmi pointed out in the comment below you can also use the contextual menu to add the new fillet.

_