Working with ENUM

Howdy?.

Good morning.

I am changing in an extensions my Options fields to Enum.
Does anybody know how I can go over the different values in an Enum.
Namely, with Options if you write this code:

for i := 0 to 5 do begin
SalesLine.type := i;
message(format(SaliesLine.type);
end;

You obtain:

' ',G/L Account,Item,Resource,Fixed Asset,Charge (Item)

And another question......

If you do not want in a page to appear all the options of an Option field (i.e: If you do not want anybody to be able to write "G/L Account" in Sales Line, you can set the property OptionCaption in the page as ' ',,Item,Resource,Fixed Asset,Charge (Item), namely, removing G/L Account from the OptionCaption), Do you know any way to achieve this with Enums?

Thank so much.