  Reverberation mapping is the leading technique used to measure direct black
hole masses outside of the local Universe. Additionally, reverberation
measurements calibrate secondary mass-scaling relations used to estimate
single-epoch virial black hole masses. The Australian Dark Energy Survey
(OzDES) conducted one of the first multi-object reverberation mapping surveys,
monitoring 735 AGN up to $z\sim4$, over 6 years. The limited temporal coverage
of the OzDES data has hindered recovery of individual measurements for some
classes of sources, particularly those with shorter reverberation lags or lags
that fall within campaign season gaps. To alleviate this limitation, we perform
a stacking analysis of the cross-correlation functions of sources with similar
intrinsic properties to recover average composite reverberation lags. This
analysis leads to the recovery of average lags in each redshift-luminosity bin
across our sample. We present the average lags recovered for the H$\beta$, Mg
II and C IV samples, as well as multi-line measurements for redshift bins where
two lines are accessible. The stacking analysis is consistent with the
Radius-Luminosity relations for each line. Our results for the H$\beta$ sample
demonstrate that stacking has the potential to improve upon constraints on the
$R-L$ relation, which have been derived only from individual source
measurements until now.
