In Fritzing bus has a different meaning than in other EDAs (where multiple wires exist in a single container), in Fritzing a bus describes pins that have an internal connection to each other in a single part. There isn’t a bus part that contains many wires (at least so far.)
One quirk (actually a bug) on part properties that may bite you, if you load 2 custom parts in to Fritzing which should have selectors, the selectors may not become active until you save the mine parts bin and restart Fritzing. If you are making custom parts these two tutorials apply to current versions of Fritzing (most of the rest are for older versions)
and this Inkscape extension makes creating schematics much easier.
If you run in to problems (which you probably will ) feel free to post the .fzpz file that is failing and one of us will give you a hand.
) feel free to post the .fzpz file that is failing and one of us will give you a hand.