Deleting index entries

I 'd like to know how you delete index entries without stepping through each one individually. Further, if you want to delete just one index entry that has multiple references how do you do it, again without stepping through each one? It gets even more annoying when you do step though as I’m getting every single index entry, not just the one I want deleted.

Now if I’m missing something here I like to know what. Help doesn’t, internet search don’t produce anything either.

There is no automatic way to do this.

The answer by @Regina to this question is the best way there is.