How to DISCARD a snapshot in 4.1.2?

[hsn]

I take snapshots while working with VM for easy rollback. There can be multiple snapshots for the same machine and there can be chained snapshots (snapshot of snapshots). The help on Delete snapshot is a little confusing and it looks like the earlier versions of VirualBox had Delete and Discard as two different options (or "Delete snapshot" and "Delete Snapshot and State"). Here is my situation:

1. Sometimes I want to Delete a snapshot to consolidate files. Idea is to merge back all the changes from the child-node back to parent. This may be possible only if there is no sibling node (only only one child node for the parent).

2. Some other times I might just want to Discard the snapshot. Idea is to get rid of all the changes I made and go back in time. Basically delete all the changes made after its parent node was made -- changes held by the current node as well as all its children nodes (and also the current state).
(or this could have been "Click on a node and select Discard all changes after this snapshot"). "Restore snapshot" will delete only "current state" and will not delete child nodes.

Can any one help me to achieve this on 4.1.2?

Thanks!

[CharlieSummers]

Can any one help me to achieve this on 4.1.2?

As a longer-term suggestion, it would be awesome if someone with intimate knowledge of snapshots would post a lengthy FAQ on their uses and management. I thought it would be a great idea to start with a "fresh" OS install and branch from there in different directions for different test purposes...instead, that machine has become a tangle of too-many snapshots per branch (to avoid losing changes made, switching branches requires yet-another-snapshot) and I'm terrified to Delete anything since the definition of "Delete" seems to be something of a moving target...