When editing a group, allow the Manger/Admin to select globally which calls should be updated.
Editing a group will allow a Manager/Admin to Add new users and remove existing users from an existing group. When (s)he presses the save button, they will be prompted with a dialog that says: "Apply the change in this group to calls:"
Choice 1 : Starting from [date/time picker]
-Add a Date & Time picker to select the time/date when existing calls should be updated.
-The default value is today.
-The user CAN select a date and time in the past.
Choice 2: Only for future calls created.
When the user chooses "Save Changes":
-Save the changes to the group (added or removed users)
-If Choice 1 is selected: update all existing calls with that group id (equal to or greater than the selected start time time/date) with the added/deleted users.
We are currently working on Groups Call Update feature.
It will allow you to add users to a group and apply the changed group to existing and/or future calls.