To Add a Bull breeding we first need to Create the Bull.
Written Instruction:
2) For Event Type-> Bred
3) Enter the Sire Name or Number Follow by a Space
4) Click to Create it
5) Save the Event
After the bull is saved you need to enter another event to make it mature as shown in the screenshot below
Note that the web browser cache will need to refresh for "Jack" to be available as a choice. This will happen automatically over a day. It can happen immediately if the cache is refreshed in the browser settings.