How to Delete Levels in Pro Sites


I have a multisite install running Pro Sites plugin. I currently have 2 levels, PRO and ELITE. Each level is a paid level, but the ELITE level includes Premium Plugins like 'Subscribe by Email'.

I would like to remove the PRO level and only offer the ELITE level, so everyone get's everything. What is the process to:

1. Remove the PRO level
2. Make sure everyone is on ELITE
3. Make sure all the plugins are active for all sites

Also, will this effect the recurring payments for the current PRO clients? I don't mind if they stay at the lower rate with the new features.

Thanks for your help.