JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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If you're referring to the dropdown field, you can set it to allow multiple selections by editing your form and then doing the following steps:
1) Select the dropdown field
2) click Allow Multiple
But if this is not what you mean, it would be great if you can share with us a bit more information of your concern.