  We present measurements of the decays B0->Ds(*)+D*-, using data recorded by
the BABAR detector in 1999 and 2000, consisting of 20.8 fb^-1. The analysis is
conducted with a partial reconstruction technique, in which only the Ds(*)+ and
the soft pion from the D*- decay are reconstructed. From the observed rates, we
measure the branching fractions BR(B0->Ds+D*-) = (1.03 +- 0.14 +- 0.13 +-
0.26)% and BR(B0->Ds*+D*-) = (1.97 +- 0.15 +- 0.30 +- 0.49)%, where the first
error is statistical, the second is systematic, and the third is the error due
to the Ds+->phi pi+ branching fraction uncertainty. From the B0->Ds*+D*-
angular distributions, we measure the fraction of longitudinal polarization
Gamma_L/Gamma = (51.9 +- 5.0 +- 2.8)%, which is consistent with the theoretical
prediction, based on factorization. These results are preliminary.
