You could use one field formatted as a check box with "status complete" as the single value value list used to format the field.
Also as a follow up. I field that listed as PM is an imported field.
Do you mean the "x" is exactly a character imported?
You can make "File Status" field as calculation or auto-enter, like as
Case ( PM = "x" ; "Status Complete" )
Changing field definition can lose your data, so make back up before try.