This might not be possible out of the box with Trello, however, have you tried copying the multi-item list and pasting it in the first item in a checklist on an existing card?
It should split out the multiple items into their own checklist items. This might be a half-way solution for what you're looking for.
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A blank Trello board can be both a beautiful and intimidating thing. How many lists should I have? Is creating 10 labels overkill? How can I best track my progress? Is there a way...
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