Seeing DDS on summary page

Is there a way to import the DDS as a tag. Trying to arrange my library by DDS.
Thanks

Not sure what you mean, but if you mean sorting your catalogue by DDS, you don't need it as a tag. You can sort by it as is.

It looks like you might have LCC set as your call number system. In settings>books>other you can change that so that you see DDS in more places. You can also edit your catalogue settings to see DDS for any books that have it listed for the work.