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You should be able to define different Marks to get to your requirement. The online help documentation details the step by step instructions to do this.
Hope it helps. Happy to help if you need further information.
Currently, all of the lines will be solid--a dotted line is not easily done. This is a good one for the Ideas section. Other options to differentiate the Last Year Revenue line may be to use a different color or size.
I have set different color for each line,
Thank you very much!