I've got a host who 4 jvms who are named
these are 4 instances of same jvm with an index.
dynatrace show me only one process
How to separate each process and showing each process on this unique host ?
You are looking for Process Group Separation.
You can use rules based on Process Properties or Java System Properties, or you can use the Environment Variables (set for the process) DT_CLUSTER_ID and DT_NODE_ID which dynatrace will pick up automatically.