A Process Group is a grouping of Processes.
For example you may decide to have a Process Group called Assembly. And you may have a various Processes in that Process Group, e.g. Preassemble, Assemble, Install, etc.
Process Groups can have a capacity - for example you may have a Process Group called Assembly with a capacity of 16 hours. This means that in any 24 hour period, Assembly has a capacity of 16 hours.
For more information on Capacity see Scheduling Capacity.
To set up a new Process Group, from the Main Management Menu go to Set Up > Advanced Set Up > Process Group
To add a Process to a Process Group, from the Main Management Menu go to Set Up > Process. Next to the Process you wish to edit, click Edit.
Change the Process Group Name to the one you require.