Allow Multiple or Single String Search Criteria Macro

Hi all, I am editing a workbook that I found on this forum, and I am trying to create a macro button that will allow a person to select either 1 sub-category criteria or several (up to 10 would be perfect, but 23 would be ideal). I am fine with creating numerous buttons to do so if that would be necessary.

I noticed while using the workbook that it will automatically populate only 7 rows in the Results field, so if there are less than 7 fields then there will be duplicates - if there are more then results will be missing. Can anyone help solve this? Below is some code that I have tried but it doesn't appear to be helping:

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Could anyone please help me out? Thank you so much in advance!