You can do this only if you are staying
onsite.
(I know, I know...you posted this on the DDP board, and you have to stay onsite to get DDP, but people do sometimes get confused.) If you are staying onsite, whether on DDP or not, you can book ADRs 180 days from your arrival, plus 10 days after arrival -- commonly referred to as 180+10.
A few suggestions. One, CRT is a whole other animal from an ordinary ADR. Go to the restaurant board and read and heed the great advice there on the CRT thread. Precisely following that advice is the only way you will get an ADR for CRT.
Two, for any Epcot ADRs during that period, avalability will be limited due to the CP packages. Two years ago, we were unable to get
any ADR for Le Cellier at 5 months out because everything was locked up by CP packages. And they won't be doing waitlists. Therefore, you'll have a lot better chance of an ADR for LC doing a CP package than you will without.
Three -- not all inventory is made available for the +10 ADRs. So if you don't get something specific you want on a particular night, you may get it if you call back exactly on the 180th day for that specific date. They apparently hold out some inventory to make it more fair for folks staying offsite.
Good luck and have a great trip!