Note: This article assumes familiarity with how snapshots work. For more information on snapshots, see Understanding Snapshots and AutoProtect in VMware Fusion (1014509).
To delete a snapshot:
If you receive an error that there is insufficient disk space to perform the operation, see Consolidating snapshots in Fusion (1020000).
Deleting your snapshots does not delete the information contained it. It merges the snapshot you are deleting with the main virtual disk (or the previous snapshot in the chain).
This is not the same as rolling back to a previous snapshot. Rolling back to an earlier snapshot deletes the information in the current snapshot, and reverts your virtual machine to the state of the specified earlier snapshot.