Can you add multiple business rules on same object and trigger?

From an enterprise perspective, we will have various groups and administrative teams managing Workfront.   Looking at the new business rules, it appears that once an object and trigger are selected it appears you cannot add another, is this accurate?   

For example, we are looking at adding validation logic to a task level upon editing of the task (e.g. block completion of task if a document is not attached to the task).   If we have multiple groups that are working off the same environment, can you add multiple business rules to support each team or do they have to be layered all into the same business rule?