helm install a chart and give parameters to the depencie chart
Review this official article. It provide good example:
helm install stable/mcrouter --name=mycache --set memcached.replicaCount=3
Other examples:
helm install stable/mcrouter --name=mycache --set memcached.replicaCount=3 --set memcached.resources.requests.memory=512Mi
helm install stable/mcrouter --name=mycache --set memcached.replicaCount=15 --set memcached.resources.requests.memory=10Gi --set memcached.resources.requests.cpu=2 --set memcached.memcached.maxItemMemory=8432