EntityGroups command - does not create group, any help needed

Hi, I would like to know more about EntityGroups as when I select the entity to group and chose the commad to quick group thse semes do not work. When I selected one entity of the group it did not select the remaining ones, so for me the group was not created. I know the diffrence between the block and group and I need the command to group. Simply I need to group few entity to copy them and edit. Any help will be approcieted. thank you. Marta

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