The easiest way to create profiles, again, is via a proper plist editing tool, opposed to notepad or similar.
You have to define a new profile, which is vendorid_deviceid, followed by profile Name
<key>10ec_0269</key>
<string>Realtek ALC269</string>
If there's already a profile for your codec, but you have a different variant and that config doesn't suite you, then you can use extended profile definition like this
<key>10ec_0269_HDA_1028_04d9</key>
<string>Realtek ALC269</string>
which uses the subvendor id of your board as well. To know your subvendor you can look in IORegistry or log in Console for the log of CC: