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Well, you can make each mark type a different shape, but I don't think that's what you mean!
(Change the viz type from Automatic to Shape, and then drop Measure Names on the Shape mark - it will assign a shape to each Name, but it isn't what I'd call attractive or easily understood.)
There isn't a simple way to have different line types in Tableau (dots, dashes, double-dashes, etc.). But there is a workaround - look at this link for ideas.
Thanks a lot Andrew....
Good learning for a beginner like me