From this dialog, you can select an existing mapping system. You can create new ones using Tools > Mapping Systems > Editor, these new mapping systems will be available under the Custom Tab of the Tools > Mapping Systems > Selector
From this dialog, you can select an existingmapping system. You can create new onesusing Tools > Mapping Systems > Editor,these new mapping systems will be availableunder the Custom Tab of the Tools >Mapping Systems > Selector