Grouping user defined features
I was wondering if it's possible to group / combine certain user defined features into a separate layer? For example I have a series of range rings I created that are associated with each wind turbine. I'd like to be able to turn on / off the display for all rings associated with a given wind turbine so it's easier to view- but they are all lumped into the one layer called 'user defined features'. I know you can delete features individually and choose not to render deleted features, but it's not very convenient...