No I am doing letter series for pre-numbered stock items, like AAA-001 thru ZZZ-999

so when issuing my program can automatically jump to the correct next letter series
i.e.
in stock starting number AAA-990
we issue 100
I want to automatically, with no users intervention say 2 lines of issuing
1st 10 each, AAA-990 thru AAA-999
2nd 90 each, AAB-001 thru AAB-90

and the procedure I am working on is just to set-up the letter series in advance
there is no combobox, I want a grid or listbox to preview the results of building the letter series
i.e. user enters starting letter: "AAA"
user enters ending letter: "AAD"
the preview will have
AAA 1-999
AAB 1-999
AAC 1-999
AAD 1-999

does this make it clearer?

>>Hello
>>
>>Not trying to be rude, but I don't need a example, because I also have a "ignored letters" i.e. "B,C" box and "ignored sets of letters" i.e. "FAG", "PMS"
>>
>>I have all the code in thought, but I am worrying about the number / lenght of the processes, running out of memory ya know stuff like that
>>
>>Thanks for the reply
>
>Stephen,
>
>There's some holes in your description. The users will enter something like cStart = "ABCDEFG", cEnd = "ABDFZZ" and you want to generate all the values in between and come up with what? Are you generating Keys for records (like lottery tickets) and the user will then enter one to access the rest of the record?
>
>What is the purpose of the combo box with all possible combinations?