Re: making jams/jellies...
Well considering that you can make jelly with just honey, water, and pectin, then yes, you can use honey as a sugar substitute in jellies.
But there is much variety amongst jelly recipes, so I don't think there is a standard conversion you can use to substitute- you have to consider that sugar is dry and honey is liquid, and you may have to compensate for that fact. You may have to be willing to experiment if you are going to change an established recipe.
But there are many good jelly recipes on Goggle that already call for honey in them- try googling them.
The little bee returns with evening's gloom,
To join her comrades in the braided hive... -Tennyson