It appears that bees just randomly deposit nectar throughout the brood area:

results show that at the early stages of nectar storage, honey bee workers mix solutions of different sugar concentrations in cells. Moreover, clustering of cells with similar concentrations occurred only occasionally, thereby indicating that workers do not follow a consistent rule for spatial nectar storage at this stage of honey production

The results show no strong evidence for optimised storage behaviour, suggesting that early spatial clustering of cells according to the sugar concentration of their content does not result in increased efficiency. 

Even though nectar is first deposited randomly around the comb, after successive relocations fostered by consumption, ripening or brood dynamics, honey stores accumulate above the brood and pollen as well as on the lateral combs

Eyer, M., Greco, M. K., Lang, J., Neumann, P., & Dietemann, V. (2016). No spatial patterns for early nectar storage in honey bee colonies. Insectes sociaux, 63, 51-59.

PLB

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