While we recommend users use Aircraft Profiles to drive downstream events like work orders, sometimes users may have "stray" work orders they'd like to tie back to an Aircraft Profile.
To link a work order to an Aircraft Profile, open an Aircraft Profile and scroll down to the "Work Orders" section. Click on the 'Actions' button, then select 
:
From the Link Work Order page, select the appropriate work order you'd like to link and click the link image at the right. 
The work order will now appear in the work order section for that Aircraft Profile.