creating a group of items in a group and having that new group stay in the main group?

alan bard newcomer

it's wonderful, how much stuff is packed into some of the items we get, but if I load Big Outdoor Scene and it then has 100 rocks, 100 blades of grass, and 57 trees all in the main group. 
I go in and group the rocks, the grass, the trees but then the new group is tossed into the scene list and I have to move it back under the group that I grouped them from. 
I'm lazy ...  just the option to parent items to new group and keep position would save time. (that's the idea of programming). 
---
so is there a key to hold down and special way to say "group in place"?