You can use the process editor to build either microflows or long-running processes. Here are some suggestions if you are wondering which one will best suit your needs.
To begin with, you should understand the basic differences between microflows and long running processes. While they are both considered business processes, a microflow is contained within a single transaction, where a long running process is multi-transactional and executes over an extended period of time (see Transactional business processes for more information). So obviously if your process requires more than one transaction, the decision of which one to use is made for you, but if your process can be designed either way, then consider the following:
By default, a process is a microflow. To change this, click an empty area of the process editor canvas, click the Details tab in the properties area, and enable the Process is long-running check box.