The SelectedGroupMemberRemove function automatically removes selected users/groups from their parent groups.
<Select columnID=""'<column ID>"" value=""<value in column>"" />
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Detailed Description
To remove members from groups:
Select the group row(s) in the Group Delivery Management grid
Use SelectedGroupMemberRemove with a selection of target user(s) in the grid, in the dialog, formatted as: <Select columnID="'<column ID>" value="<value in column>" />
(<column ID> is the ID of the column you want to make the selection)
Add as many <Select columnID="'<column ID>" value="<value in column>" /> as you'd like to make the desired selection