If your list isn't too long, you could set up a CASE statement to output the model year.
SELECT
...
CASE
WHEN tblAssetCustom.Model IN ('OptiPlex 7010', 'OptiPlex 9010')
OR tblAssetCustom.Model LIKE 'Latitude E6530%' THEN 2012
WHEN tblAssetCustom.Model = 'OptiPlex 7020' THEN 2014
WHEN tblAssetCustom.Model = 'OptiPlex 7040' THEN 2015
WHEN tblAssetCustom.Model = 'OptiPlex 7050' THEN 2018
WHEN tblAssetCustom.Model LIKE 'Latitude 6540' THEN 2013
etc.
END AS [model year]
...
FROM
...