After editing a group externally, you can load or reload it into a project or family.
To load (or reload) the group into a project or family
The group opens as a project file (RVT) if you are in the project environment, or opens as a family file (RFA) if you are in the Family Editor.
Model panel
Model Group drop-down
Model panel
Model Group drop-down
The group is loaded into the project (or family), and the group file remains open.