title: In PyCharm, how do you add a directory from one project as a source to another project?
body: <p>I have several python projects started from git repos, all related to each other, that are all open in one PyCharm window.</p>
  
  <p>I have python code in one project, call it  project B, that imports python packages from project A, but PyCharm can't find the source. </p>
  
  <p>I've marked the directories with python packages in project A as source directories in PyCharm, and indeed other code in project A can lookup these python packages. But these source directories don't appear to be part of the lookup table for other projects in the same window.</p>
  
  <p>Is there any way in PyCharm to make one project recognize directories from another project as a source directory?</p>