Can't boot Bootcamp after repartitioning the MacOS Partition.

Hello, I recently decided to make an extra partition on my iMac's drive, since i was using up all the space on the bootcamp one. Turns out, after creating another partition, the bootcamp partition dissapeared from the boot menu (the one you press alt for at bootup). And i cant decipher all the other forum posts about this, so it would be nice for someone to help me here.

Thanks in advance, Aborted Child.