Currently, the process to use same list across different models is a complicated process of importing lists from one model to another.
If Anaplan really plans to be the a Connected Planning tool, they should have a feature of having a Universal List that can be used across all models without doing import. I am proposing that this Universal List is readily useable in all models. In short, each model will have 2 sets of lists: Universal List and Model Specific List.
Hope this feature is considered. If there is an official Feature Request forum, kindly move this post there.
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Please consult your internal administrators prior to applying any of the ideas or steps in this article.