I have the same problem with CIS.
We used a Fitted property to display "Not Fitted" in the BOM and on the schematic before CIS, but I haven't been able to get the contents of this variable to display on the CIS Standard BOM Report. I have added Fitted to the list, but the BOM doesn't actually show the contents of the property.
We need the BOM to display values and other information even for non-stuffed parts, which rules out the use of Variants.
I have tried adding the property to the schematic symbol, adding the property to the CIS Database (using all combinations of the Transfer to Design and Update Part Property when mapping it), and both in the symbol and in the database, it doesn't help, the Fitted property has a column in the BOM but doesn't display anything in the column. All I get is a statement that there is a mismatch of the Fitted property between the parts with the "Not Fitted" string and those without.
Any thioughts anyone has in reference to this would be appreciated :)