The Gravity Forms plugin GP Limit Choices enables you to restrict the number of times each “choice” on a multi-choice field (such as Radio Buttons, Checkboxes, Drop Downs, etc.) may be chosen. With these input types, it also functions with Product and Option fields.
You may establish a restriction per choice on your multi-choice field using this benefit. A choice will disappear from the field on the front end if it exceeds the limit that was set. Despite being visually removed from the frontend, the choice is still accessible in the form editor, allowing the cap to be changed.