Service exclusion for Vesting

[flosfur]

If an employer has a predecessor plan, then a new plan cannot exclude service prior to the new plan's effective date.

What if the employer maintains two plans concurrently? For example, an employer has a 401(k) or a Profit Sharing plan which will continue in existence. The employer now wants to establish a DB Plan. For vesting, can the DB plan exclude service prior to its effective date?

What happens if the non-DB plan is terminated after 2, 3, 4 ... years?

[Effen]

benefits link

I think the attached contains your answer. As you will see, I was shown the light.