Parts making isn’t easy, but is possible if complex. These tutorials apply to the current version (most of the rest are for earlier versions of the code):
(Edit: November 2016: This is an updated (and corrected) version of the original parts creation howto. This version corrects some suggestions (mostly saving Inkscape files as optimized svg which turns out to cause other problems) with the first version and expands the section on parts testing. While there doesn’t appear to be a lot of interest in this subject I’ll make at least this update so the information is as correct as I can get it.)
This is a description of how I made the Valor PM6078-00…
Fritzing Part Creation - Chapter3 - Inkscape Advanced Essentials
Looking at more Inkscape features.
Someone in this forum post
requested help to fix up a part. So while doing that I decided to record what I needed to do in order to fix the part to provide a tutorial to create new / fix broken parts. If you start from the Tarjeta S4A EDU.fzpz file posted in the above thread, you should be able to recreate my improved part posted in the same thread. I started by loading the original part in to Fritzing, that indicates breadboard is (at first look anyway) pretty good, but schematic and pcb are…
if you only need a couple of parts it likely better to ask, and we are always willing to help you make parts.
Peter