How can I share functions across multiple projects within a project suite?

did you do like this..?

according to documentations 

"Adding an existing test does not create a copy of this test, it just adds a reference to the project. The test file remains in the original project. If you change the imported test in the current project, it will be changed in the original project as well."

https://support.smartbear.com/viewarticle/74500/?utm_source=site-search&utm_medium=search-results&utm_campaign=site-search-c&utm_term=Importing+Tests#_ga=1.112393613.809719160.1405381514

I did this, but the piece I was missing is that it refers to the file on the disk, so until you do a save the copy is not updated.  Once you save it the updates show up across all of the versions.

Thanks for the reply.