  The electroweak sector of the Minimal Supersymmetric Standard Model (MSSM) -
neutralinos, charginos and sleptons - remains relatively weakly constrained at
the LHC due in part to the small production cross sections of these particles.
In this paper, we study the prospects of searching for decays of heavy Higgs
bosons into these superpartners at the high luminosity LHC. In addition to the
kinematic handles offered by the presence of a resonant particle in the
production chain, heavy Higgs decays can be the dominant production modes of
these superpartners, making it possible to extend coverage to otherwise
inaccessible regions of the supersymmetry and heavy Higgs parameter space. We
illustrate our ideas with detailed collider analyses of two specific
topologies: We propose search strategies for heavy Higgs decay to a pair of
neutralinos, which can probe heavy Higgs bosons up to 1 TeV in the intermediate
tan $\beta (\sim 2-8)$ region, where standard heavy Higgs searches have no
reach. Similarly, we show that targeted searches for heavy Higgs decays into
staus can probe stau masses up to several hundred GeV. We also provide a
general overview of additional decay channels that might be accessible at the
high luminosity LHC. This motivates a broader program for LHC heavy Higgs
searches.
