Sometimes in Asana you need to alter a custom field type, or clean up by using an existing field.
In those cases, this video will help you migrate tasks from one field to another!
Enjoy 
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This is a great workaround for data migration. You can also create a project with rules to automate it when the task is added to the project:
eg. If a new task is added to a project & the single select custom field is YouTube, then change the multiselect custom field to YouTube.
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