I would like to add a new individual to a text group, with the option to send the text history to the new individual. Either all or for a time period, ie today or last hour.

I would also like to remove an individual, but either keep or remove their text history.

Reasoning for Request
Often I have been in a text group and for whatever reason I need to add someone to a discussion. Everyone has to move over to a new text group with the new person.

After a person is no longer needed in a text group the same problem happens. In both cases the information is kept in a text group that is no longer available.