I have created a layer contaning data of all the tornados to occur in california since 1950. I have duplicated this layer. so there are two layers in my content pane - Cal_torn_map (the original) and ElninoTornados (the duplicate)
what i am trying to do is make changes to the duplicate to show only tornados from specific years, as opposed to showing all tornados like the original.
The way i was trying to do this is delete data from the attribute table of the duplicate to remove the points from the years i dont want, but when i do, points from the original are also deleted.
Is there a way i can make changes to the duplicate without effecting the original?