Adding WI SSD's to existing two tier (RI SSD, HDD) system

We currently have an existing system with a tier 1 or RI SSD, and a tier 3 of slower HDD.   What would happen if we added a group of 6 WI intensive drives to the eixsting system ?  I mean conceptually the WI drives should form a new Tier 1, the Tier 1 will be tier 2.  but does the storage manager/compellent system automagically do this, or do you have to involve Compellent/Dell Storage to reconfigure this ?  I dont see the ability to add/remove/configure tiers in SM.  

We'll probably have to talk to them anyway to remove the R10 Mirror on Tier 3 regardless (and possibly the R10 on Tier 2 as well) since all the writes on the system will be on the fast and write intensive Tier 1 with everything else just being varying classes of performance storage.