Deleting the first field in a table to create a calendar

Thanks in advance for your help. I am stuck. We created a calendar of classes for a schedule and used a Single Line Text format for that field (which is our primary field). Now we wish to change the field to use a Multiple Select so that we can color coordinate and dump into a calendar. We wish for different classes to have different colors. We cannot figure out how this can be done.

Can someone help?

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