I ran this quick query that I thought you might be able to use as a skeleton on which to flesh out your own query to build your Form on.
Create a new query.
Select all the fields you will need from your table [the fields that are on your Form].
Then - in a new field in the Query Type something like this:
Code:
DupeField: IIf([Preferences] In ("GRA", "Geo-T"),[Preferences])
If the [Preferences] field of the current record has one of the values ("GRA", "Geo-T") - then that value will be written to the new field that I named 'DupeField'.
Once you have this query working the way you need - you can go into your Form in design view and change the 'Record Source' in the Property Sheet - Data tab. Then your Form will get all the data from the Table - Plus the duplicated values from the Preferences field in the new field 'DupeField'.
Hope this helps.