So I can't save it or you wont be able to open it in an older version of Tableau.
see results here:
Select Codes w/null and do a Create Group.
make the group look like this by select Include Other and selecting each state abbr and hitting Group.
then put that custom group on your filters as well and select exclude Other
your dimension Codes w/null (not the group) should also be placed on the the filters card below your custom group, choose Use all
then hit ok. Then right click that same field in the filters card and hit SHOW FILTER, then go over to your filter and choose the ONLY RELEVANT VALUES. that should leave it dynamic...Good luck
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