Manual merge option

[NohWayJose]

My IFA (financial adviser) uses a different e-mail each time he writes. He seems to make it up each time. I'd like to be able to multi-select all the various of his entries and then in the hamburger menu have an option to merge. Where there are multiple e-mail addresses, they should end up in one merged record as a list of alternatives. I can sort them out later but my address book returns to usable.
Thanks