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Your question is not being answered because you posted in Tax Talk. No one wants to talk about this.

Now that my lecture is over, maybe https://accountants.intuit.com/support/en-us/help-article/multi-state-taxes/entering-multi-state-amo... will help you to produce a Full year DE return with a part year MD return.  I think you are likely correct about the city tax being a fixed percent of wages = end of story.