In the course of a general discussion on completion and filing of form RC4616, CRA stated:
[Filing by one specified member]
[T]he first specified member identified in Part A on the paper Form RC4616 may file the form on behalf of all specified members wanting to make or to revoke an election. That is, where there are more than two specified members of a qualifying group making an election or revocation of an election, only one Form RC4616 is required where all of the pair combinations of specified members whose names are listed in Part A (and on any attached page) are making the election or revocation.
[Quebec form]
...If the same members of the qualifying group also want similar relief from the...QST...they would be required to elect...by filing with Revenu Québec (provided they are not selected listed financial institutions) the Form FP-4616... .
[MyBA filing/viewing/amendment]
...[E]lectronic filing of the election or revocation...is expected to be available through My Business Account (MyBA) in mid April 2015. Once electronic filing is available, registrants will be able to view, through MyBA, section 156 elections that they have filed, either electronically or by using the paper Form RC4616, as well as those filed by another specified member on their behalf.
...[Once] a section 156 election has been filed either electronically or on paper, the election can be modified through MyBA. In the case of a particular specified member of a qualifying group wishing to elect with another specified member (or members) of that group after 2014, the response provided to question 1.e applies whether the election was filed electronically using MyBA or the paper Form RC4616.