  A Yamabe soliton is considered on an almost contact complex Riemannian
manifold (also known as an almost contact B-metric manifold) which is obtained
by a contact conformal transformation of the Reeb vector field, its dual
contact 1-form, the B-metric, and its associated B-metric. The case when the
potential is a torse-forming vector field of constant length on the vertical
distribution determined by the Reeb vector field is studied. In this way,
manifolds from one of the main classes of the studied manifolds are obtained.
The same class contains the conformally equivalent manifolds of cosymplectic
manifolds by the usual conformal transformation of the given B-metric. An
explicit 5-dimensional example of a Lie group is given, which is characterized
in relation to the obtained results.
