On the Marks card, toggle to each different mark type and place the desired field on the color shelf. If you want to use Campaign Type on both mark types, but want to have 6 different colors, right click on Campaign Type in the data box and select Duplicate. Then, use the Campaign Type (copy) field in place of one of the Campaign Type fields on one of the color fields. Finally, edit the colors within one of the color legends. I hope this helps!