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Radio buttons are expressly used to allow only one selection. If you need to allow for multiple selections, I would recommend using a check box field. You can then set the minimum and maximum number of selections allowed from the fields options. Once you have your check box field added, click on the field, then click on the little gear icon to bring up the properties:
From there, you can adjust how many selections can be made in that field.
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Please see my reply in the other thread where you asked this same question.