I have a customer that wants summer hours and winter hours(day/night). Winter is from October to March and Summer is April to September. Short of burning 4 RPO keys to manually set it, how can i set it to go automatically?

Can't see how you could do it automatically.

How about DM 4.3?

4.3 as in Holiday scheduling? There are 60 entries he needs about 180

I would train the customer to adjust the ring plan time manually it wouldn't be that hard to do.

I was thinking 4.3.1 auto ring plan then bulk programming in holidays. I think you can do a full month under one entry?