We have reported on this before:

> Here we describe, based on our experience and primary research, the techniques necessary to successfully maintain multiple queen colonies and how they can be used commercially.  In practice, these colonies are used as supporting units for the faster build-up of productive colonies and for the production of royal jelly.

> Close supervision of the colonies is necessary in routine management. These colonies may build queens cells despite the presence of multiple queens

Maintenance and application of multiple queen colonies in commercial beekeeping
Huo-Qing Zheng, et al. Journal of Apicultural Research and Bee World 48(4): 290-295 (2009)

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