Zhitom has shared his experience creating a dualboot Raspbian and Recalbox-OS with Noobs
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Download Noobs « Offline and network install » (contain the latest Raspbian version) at the following adress : https://www.raspberrypi.org/downloads/
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Unzip the zip archive and copy all the files at the root of the SD card formated with the SDFormatter software :https://www.sdcard.org/downloads/formatter_4/eula_windows/SDFormatterv4.zip
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Download the latest Recalbox version at the following adress:https://github.com/digitalLumberjack/recalbox-os/releases/latest
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Unzip the archive and copy the folder "recalboxOS-rpi2" ( or "recalboxOS" depending on the version ) located in the folder "os" to copy it in the folder "os" at the root of the SD card.
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The SD card is ready, you only have to insert it in the Raspberry !
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At the first boot, after the splashscreen, a window will appear with multiples OS to choose. Check Raspbian and Recalbox then click to "Install" or type i.Just wait a dozen minutes for the end of the installation.
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At the reboot, after the splashscreen, a new window will appear with the choice of the OS to start with. Choose Raspbian or Recalbox and you are done !
By default, timing screen for the OS selection is 10 seconds, after, the system will start the previously os launched.
For information : When you do a dual boot raspbian/recalbox with a 16Go µsd card, the free space is allocated by defaut like this : 4,1go for raspbian and 3go for recalbox.