How can I add a new milestone marker for each date column I have and keep a Gantt flow?

edited 12/08/22 in Smartsheet Basics

I have 3 date columns in a row and want to create a Gantt chart that marks each date separately and has some sort of flow. I tried to set up dependencies and to have the duration column be 0 to use a milestone marker but that automatically made the parent task 0 since dependencies are enabled.

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