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Same question this year, hoping to get a concrete answer this time.

TT is asking "As a married couple filing a joint return, you may be able to exclude part of your income from Maryland taxes. To help us determine how much you qualify to exclude, enter (my) portion of the total amount for each item listed below. We'll allocate the rest to (husband)."  There are two prefilled items, the first is "Taxable State Refunds" with a prefilled total amount of $0, and a dollar amount I can fill in to allocate to me, and the second item is "Other Maryland Subtractions" with a prefilled amount of $20,000 and a box to fill in what dollar amount to allocate to me.   You had said "If you tell us what Maryland is asking you to allocate" well, that's what I'd like to know as well.  How am I supposed to know what portion of "other maryland subtractions" should be allocated? 
@ErnieS0