When adding a decision in a process flow, promapp doesn't allow to add more than 1 activity (sometimes, what you need is just 2 or 3 activities, not another process) on a YES or NO outcome.
The CONTINUE option just lets you continue with the rest of the process flow.
Its not ideal to create another process with 2-3 activities as the activities are part of the current process based on a YES/NO outcome.
Hope Promapp fixes this soon.
Decision boxes are deliberately limited, to avoid overly complex processes. This has been a design choice since the beginning and keeping processes simple is a mantra for Promapp.
That said, it is possible to have multiple decision boxes, although we tend to avoid them:
Happy to spend some time with you to talk through the underlying intention for the design as it currently is and perhaps there is another angle for the process that you are designing. Feel free to reach out to me if you'd like to chat.