Currently in, Enterprise Architect (EA), it is not possible to create a workflow that your modellers have to follow and have EA enforce that flow…but all is not lost there is still something that you can do.
One thing that you can definitely do is create a model that defines the flow of activities that you expect your modellers to follow as they execute their day to day tasks.
This can then be set as the model default on your repository which means that every time a modeller opens the repository, the first thing that EA will do is open & present your guidance model to them. This can act as a very handy reminder that there are processes in place that need to be followed when modelling.