Character function like CHR (ascii_code_number)

I am sorry, I didn’t found answers in the reference even in the other forum topics, so that I will trouble you with these questions:

I tried the list field as you advised: I’ve created the list field, then I’ve chosen “set list”, but I can’t find “parent list”. I found “:plusitem” but I can’t find “:plusitem parent”. Where can I find them, please ?

One more question: if I have the list field working, how can I refresh the repeating group with the messages stored in this list field. Can I remain the Clicked message with these messages “above” and remove those message “below” from RG (not to delete from database)?

Thank you in advance.

I think, it is better to move my new questions to new topic:

I hope, you will help me.