From the Designer, it is possible to build a few packages at once. Simply select all the desired processes (Windows/Linux: Ctrl+clic ; macOS: Command+Clic) and right click / Build / Package. The built packages will be generated under "stambiaDesigner/stambiaRuntime/build/packages", as usual.
Note: this method is not appropriate for building a lot of packages. When you need to build more than 10 processes, please consider using the Command line.
More information about building packages: http://www.stambia.org/doc/57-stambia-di-software/designer/how-to/464-building-packages