Because of the way globals work, both `mychart/templates/configmap.yaml` and `mysubchart/templates/configmap.yaml` should be able to access that value as `{{ .Values.global.salad}}`.
Because of the way globals work, both `mychart/templates/configmap.yaml` and `mychart/charts/mysubchart/templates/configmap.yaml` should be able to access that value as `{{ .Values.global.salad}}`.