Final answer:
An omnibus bill is a packaged bill that combines multiple unrelated measures into one bill. It affects the budgetary process by enabling comprehensive policy changes without the need for multiple votes.
Step-by-step explanation:
An omnibus bill is a packaged bill that combines several unrelated measures into one bill, often with the aim of quickly accomplishing policy changes. These bills are typically attached to the budget resolution, allowing for an up or down vote on the whole package. Furthermore, omnibus bills affect the budgetary process by enabling Congress to make comprehensive policy changes without the need for multiple votes and long periods of time. They expedite the budget decision-making process and have become a common problem-solving mechanism in the legislature.