Hi Paula,
We do have a training out that covers how to handle Effective Dating! It covers using different formulas and list techniques to help be able to track changes. You can find it by clicking on the Learning Center link above, logging in and then looking under the 300 Level Advanced Topics.
The course is called 311 Effective Dating.
You can also use the direct link below.
[url=https://learning.anaplan.com/course/view.php?id=512]https://learning.anaplan.com/course/view.php?id=512
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-Chris