Take the utility function from a bunch of POMDPs and combine them together using a fusion function.
\begin{equation} U^{*}(b,a) = f(U^{*}(b_1, a) … U^{*}(b_{n}, a) \end{equation}
where f can be sum or min. The overall belief b is simply B_1 \times … \times B_{n}, which combines all beliefs together.