Flex: The Cattle Return “CR" and the Paddock Book “PB" are separated. You can have separate names for cattle in your PB and CR. Any changes you make in your PB that affect the CR (Brand, Mortality, Transfer In, Transfer Out, Bought, Sold) will affect the Cattle Return. You will be required to select which CR Cattle Type they relate to. You can use the Bush action to send as many cattle into a paddock as you like, which will not affect the CR. This will overwrite whatever number and class of cattle you had in that paddock.
Rigid: The Cattle Return “CR" and the Paddock Book “PB" are work as one. Any changes you make in your PB that affect the CR (Brand, Mortality, Transfer In, Transfer Out, Bought, Sold) will affect the Cattle Return. You can only create cattle by Brand, Bought and Transfer In.