How to separate BPMS 6 instances to serve either for authoring purposes (Business Central application) or as execution server ?

Issue

• Users might think of a topology where BPMS authoring environment (i.e. Business Central) is separate than execution server. So, that Developers will only use authoring environment for creating process models, rules etc. and deploy them to execution server. Where can users find steps to install execution server that runs without Business Central? Meaning, the server does not have any authoring capabilities; it just provides execution capabilities.