Yes, although it sucks you in to parts creation hell Image may be NSFW.
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. It is described in the fpz file format document at
https://github.com/fritzing/fritzing-app/wiki/2.1-Part-file-format
Someone recently posted some CMOS gates using this technique which is where I found out about it from. Once I get a bit further along in parts creation hell I intend to use it.
Peter Van Epp
