Multiple Field Type in Properties_Dropdown and single line text

In Deal Properties, I want to create a drop-down selection for Closed Lost Reasons. These might include no budget, not interested, etc. and other. However, when the sales representative chooses the other option I want them to give a description of the other reason. Otherwise, in the past, I've seen that not to lose time the reps just go ahead and choose other without an explanation. Which gives no feedback/insight to Marketing.

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