  As an alternative to direct measurements, we extract exclusive branching
fractions of semileptonic B-meson decays to charmed mesons, $BF_i(B\to
X_c^il\nu)$ with $X_c^i = D, D^*, D_0, D'_1, D_1, D_2, D', D'^*$ and
non-resonant final states $(D^{(*)}\pi)_{nr}$, from a fit to electron energy,
hadronic mass and combined hadronic mass-energy moments measured in inclusive
$B\to X_cl\nu$ decays. The fit is performed by constraining the sum of
exclusive branching fractions to the measured value of $BF(B\to X_cl\nu)$, and
with different sets of additional constraining terms for the directly measured
branching fractions. There is no fit scenario in which a single branching
fraction alone is enhanced to close the gap between $BF(B\to X_cl\nu)$ and the
sum of known branching fractions $BF_i(B\to X_c^il\nu)$. The fitted $BF(B\to
D^*l\nu)$ is 5% to 10% larger than the direct measurement depending on whether
or not $BF(B\to D^*l\nu)$ is constrained to its direct measurement. $BF(B\to
Dl\nu)$ values are in good agreement with the direct measurement unless
$BF(B\to D^*l\nu)$ is constrained, which results in a higher $BF(B\to Dl\nu)$
value. Within large uncertainties, $BF(B\to D'_1l\nu)$ agrees with direct
measurements. Depending on the fit scenario, $BF(B\to D_0l\nu)$ is consistent
with or larger than its direct measurement. The fit is not able to easily
disentangle $B\to D_1l\nu$ and $B\to D_2l\nu$, and tends to increase the sum of
these two branching fractions. $BF(B\to (D^{(*)}\pi)_{nr}l\nu)$ with
non-resonant $(D^{(*)}\pi)_{nr}$ final states is found to be 0.2-0.4%,
consistent with $B\to D^{(*)}\pi l\nu$ and $B\to D^{**}(D^{(*)}\pi)l\nu$
measurements. No indication is found for significant contributions from so far
unmeasured $B\to D'^{(*)}l\nu$ decays assuming that the $D'$ and $D'^*$ can be
identified with the observed $D(2550)$, respectively, $D^*(2600)$ state.
