Crystal Reports Use a formula as a group

Message

     Hello everyone, 

I tried to use a formula as a Group but I cannot use it in the Group Expert. 

So basically for each document (for each page i want to display in the report) we have one or more TARIC NumbeR (to be simple we can compare that to one or more items in one invoice) . See below a brief part of the requirements about my problem. 

If we have more than 1 TARIC to list, we will add more than one page In the added pages, the areas 31 and 44 are repeated 3 times per added page 

Thus if we have : 
• 1 TARIC, it will be displayed on the first page « Sheet A » 
• 2-4 TARIC, TARIC 1 on main page « sheet A » and the others on the added page 
• 5-7 TARIC ; TARIC 1 on main page, TARICs 2-4 on added page 2 and TARICs 5-7 on added page 3 
• And so on 

Here's how the structure of the data in my report 

Document number----DepotNumber----Order Number -----TARICNumber 
456425245224...............1234..................... 30 .................... 1000 
456425245224...............1234..................... 30 .....................4545 
456425245224...............1234..................... 30 .....................7853 
456425245224 ..............1234..................... 30 .....................5456 
456425245224.............. 1234..................... 30 .....................5454 

817655421425.............. 1234..................... 40..................... 3999 
817655421425.............. 1234..................... 40..................... 0545 
817655421425.............. 1234..................... 40..................... 3218 
817655421425.............. 1234..................... 40..................... 7245 

654034141354.............. 1234 .....................65..................... 8031 

The data are grouped on DepotNumber and Order Number . One document can be identified with these 2 Numbers. 

Well, here's the result of what i did to get the grouping
Doc----Depotr----Order -----TARIC 
456425245224........1234............. 30 ............. 1000.....1.......break1 
456425245224........1234............. 30 ...............4545.....2......break2 
45642524522..........1234............. 30 ..............7853.....3.......break2 
456425245224 .......1234............. 30 ...............5456.....4......break2 
456425245224....... 1234............. 30 ...............5454.....5......break3 

817655421425....... 1234............. 40.............. 3999.....1.......break1 
817655421425....... 1234............. 40.............. 0545.....2.......break2 
817655421425....... 1234............. 40.............. 3218.....3.......break2 
817655421425....... 1234............. 40.............. 7245.....4.......break2 

654034141354....... 1234 .............65............. 8031.....1.......break1 

First I insert a RunningCount 

//Reset of RunningCount 
whileprintingrecords; 
numbervar CountTest; 

if not inrepeatedgroupheader then 
RunningCount := 0; 

//RunningCount in the detail section 
whileprintingrecords; 
numbervar RunningCount ; 

RunningCount := RunningCount + 1 

Then i create a function like 
if RunningCount = 1 then break 1 
if RunningCount = 2 then break 2 
if RunningCount = 3 then break 2 
if RunningCount = 4 then break 2 
if RunningCount = 5 then break 3 

THE PROBLEM is that i can't use this funtion to group the data.... 
Any suggestion ? 

Thanks a lot