Yes, if you have identified the amount in Box 1a includes sales tax, you can adjust this by checking the box "This amount in box 1a is too high..." Note that by checking this box, you are saying that the 1099-K is incorrect (in your case, because it includes sales tax that is not income to you).
If you have other adjustments related to this hobby income, follow the instructions from ThomasM125 to report the total as negative Other Income.
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