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Understanding Plan Groups
  Users can change between plans
  only within the same group. If plans in the group are different by nature (Unix and Windows),
  such changes cause losses in user data. To minimize such losses, plans of different nature are either put
  into different groups or left outside any group. Each plan can be only in one group.
  Each group should consist of two and more plans. It makes little sense to put one plan
  to a separate group. You should always group plans based on their compatibility.
  You must always stick to the following rules: 
 
   
    - Don't group plans with different platforms (for example Windows
    and Linux hosting), or this will lead to unexpected results.
    A very common mistake is to put trial plans, Unix and Windows2000,
    into a separate group. This will not allow trial users
    to switch to pay plans, as they are in a different group,
    and if users switch from Windows2000 Trial to Unix trial,
    they will lose the settings that are unavailable under Unix
    plan, including ASP and ODBC service.
 
  - Don't group E-mail Only plans with other plan types.
    Users can't switch from E-mail Only to, say, Unix plans, and if
    they attempt to do so, they will get an error.  Instead, users
    need to create a new Unix account and delete the e-mail only account.
 
  - Don't group Reseller plans with any other plan types.
    Users can't switch from, say, Unix plan to Reseller plan. Instead, users
    need to create a new Reseller account and delete the Unix account.
 
  - Don't group plans if they are bound to different servers.
    Compatible plans keep data on the same box and don't require
    any reconfiguration.
 
   
Starting from version 2.3 users can switch between paid and
no billing plans. 
Note: after your users having Summary Disk Usage turned off switched to the plan that
had it turned on, make sure to enable Summary
Disk Usage manually. 
  
Grouping Plans
     To group plans: 
      
       - Select Plan Groups in the Info menu:
          
 
  
       - You will be presented with a screen with unassigned plans
           on the left and groups of compatible plans on the right:
	  
  
        - Check the plans you would like to put into one group.
 
       - Enter group name.
 
       - Click Submit Query.
       The plans will be moved from the list of Available plans into the Plan groups list.
 
     
     
     More about plan groups management: 
     
         - To ungroup plans in a group, click the DELETE button next to the group you want to delete.
 
         - To add a plan to the group, delete the group first and then create a new one, with the plan you wanted to add.
 
         - To regroup plans, you must ungroup them first, and then group them the way you want.
 
         
          
                    
                    Billing on Changing Account's Plan
                      
                    Billing on End User Account's Plan Change 
                    - Versions before 2.4 
                    Changing plans closes
                    current billing period. Users are issued
                    prorated refunds
                    and then charged absolute recurrent fees for a new billing
                    period. 
                    - Version  2.4 and higher 
                    If no billing period change is implied,
                    changing plans doesn't close the current billing period. 
                    
                     
                    | If recurrent fee
                    calculated based on target plan prices and free units
                    is: |  
                    | >  | < |  
                    | 
                    refund for the resource
                    unused on the source plan,
                    users switching to a new plan are: |  
                    | charged | refunded |  
                    | the difference. |  
                    
                      Example 1: 
                      A customer is using 3 dedicated IPs one of which is over free
                      in his plan and each billing period he pays $2 of recurrent fee for it.
                      In the middle of one month billing period the user swithches to a plan that
                      charges $4 of recurrent fee for each IP over 1 free.
                      On a new plan the user appears to be using 2 dedicated IPs that he must pay
                      for. The recurrent fee of
                      $4 (= 2 IPs over free x $4 x 15 days / 30 days) to be paid for the rest of the
                      billing period is subtracted from the refund of $0.5 (= $2 x 15 days x 50% of
                      refund percentage/
                      (30 days x 100%)). As the resulting amount is negative, the user is charged
                      the difference of $3.5 as the recurrent fee. | 
                      
                      Example 2:  One-month billing period starts on November 1 and a
                      user with 3 dedicated IPs on a plan allowing only 2 for free is charged $4
                      recurrent fee for the 3rd one. Refund percentage for dedicated IP is 100%.
                      A plan that the user swithces to on November 15 allows 1 free dedicated IP and
                      charges $1 as recurrent fee for each one over free. Thus on a new plan the
                      user
                      appears to be using 2 dedicated IPs that he must pay for. The recurrent fee of
                      $1 (= 2 IPs over free x $1 x 15 days / 30 days) to be paid for the rest of the
                      billing period is subtracted from the refund of $2 (= $4 x 15 days x 100% /
                      (30 days x 100%)). As the resulting amount is positive, the user is credited
                      the difference of $1 as a refund.
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