Based on the rules which generated "Arvit
(Sephardic)," "Arvit (Sabbath)" and "Arvit (Sephardic
: Sabbath)," the heading needed
is "Arvit (Reconstructionist : Sabbath)."
The "rite" qualifier, "Sephardic" or "Reconstructionist," is prescribed
by AACR2R rule 25.22A. The "explanatory" qualifier
"Sabbath" is prescribed by rule 25.5B1
and distinguishes the Sabbath Arvit from other parts
of the liturgy also called
"Arvit." Both qualifiers are necessary to distinguish the
work represented by the heading from, on the one hand, non-Sephardic
Arvits and, on the other, non-Sabbath Arvits. The order of
the qualifiers analyzes the Sephardic Sabbath Arvit as part
of the Sephardic Arvit liturgy in general.
Using the same rules, we get "Arvit (Reconstructionist
: Sabbath)" for the "Kol ha-neshamah" work being cataloged.
Since there's no conflict (so far) for the
basic heading "Arvit (Reconstructionist)," it's
not necessary to further
qualify this heading (per rule 25.22A, end of the
rule) by a second term such as "Federation of Reconstructionist
Congregations and Havurot."