This screencast outlines the procedure necessary to schedule a shared parameter through a link using Revit.

  1. Note a family in the linked project that has the shared parameter you are hoping to schedule.
  2. Close the linked file.
  3. Open the host project and link file.
  4. Find a view, press Tab as you hover over one of the families containing the shared parameter you wish to schedule, and click to select it.
  5. Choose Copy to Clipboard and then choose Paste > Aligned to Same Place.
  6. Delete the pasted family.
  7. Go to your schedule and be sure to check the box for “Include Elements in Links.”
  8. Select parameters needed, including the shared parameter which is now available to select.