Using-pepcli.md

@@ -108,7 +108,20 @@ pepcli ama column addTo      <column name> <column group name>
 pepcli ama column removeFrom <column name> <column group name>
 ```
 
-Such column groups are used by `Access Administrator` to [provide data access to users](Access-control#access-rules).
+When columns are added to a column group, those columns immediately become available to users who can access the column group.
+
+Column groups can be created and removed using [the `pepcli ama columnGroup`](#ama-columnGroup) subcommand. `Access Administrator` can [grant access to column groups](Access-control#access-rules) using the `pepcli ama cgar` subcommand. 
+
+### `ama columnGroup`
+
+The `columnGroup` subcommand allows `Data Administrator` to create and remove column groups:
+
+```
+pepcli ama columnGroup create <column group name>
+pepcli ama columnGroup remove <column group name>
+```
+
+Once a column group has been created, use the [`pepcli ama column`](#ama-column) subcommand to determine which columns are included in the group. `Access Administrator` can [grant access to column groups](Access-control#access-rules) using the `pepcli ama cgar` subcommand.
 
 ### `ama query`