Multiple choice option for descriptive flexfields

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Hi, I am looking to see if it's possible to do a multiple choice option for a descriptive flexfield. Basically, I have a use case where I want to be able to select several values from the same value set, but not necessarily all of the values and definitely not just one of the values.

The only thing I can think of to kind of circumvent this is by creating X amount of segments where X is the values I have, and having each segment as a check box. This would work but it would be a bulky and ugly solution with nearly 20 different segments to fulfill all of my cases.