We study the contributions of intermediate bottomonium-like Zb states and the bottom meson loops in the heavy quark spin flip transitions Υ(4S)→ hb(1P,2P)π+π-.Depending on the constructive or destructive interferences between the Zb-exchange and the bottom meson loops mechanisms,we predict two possible branching ratios for each process:BRΥ(4s)→hb(1P)π+π≈(12-0.4+0.8×10-6) or(0.5-0.2+0.5×10-6),and BRΥ(4S)→hb(2P)π+π-≈ (7.1-1.+1.7×or (2.4-0.1+0.2 × 10-10).The contribution of the bottom meson loops is found to be considerably larger than that of the Zbexchange in the Υ(4S) → hb(1P)ππ transitions,while its decay rates are not comparable to those of heavy quark spin conserved Υ(4S) → Υ(1S,2S)ππ processes.We also predict the contribution of the charm meson loops in the branch fractions ofΨ(3S,4S) → hc(1P)ππ.