Formula to Update a % Complete on a Row

I have a project schedule with the % Complete, start and end dates. I have a checklist that is another Smartsheet used by another group. I would like to right a formula that will mark a task at 100% complete when the other checklist is complete by another group. It looks like that the % Complete column will not allow a formula because it is used as a part of the Project Dependency Settings. I wanted to see if anyone knew of a workaround to update the % Complete column based on other sheets or fields.



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