You mean you are drawing some text based on some number attribute or whatever, and you don't want that number to ever get higher than 999? You could always insert some "if" logic to clamp the number, like "if (number attribute) > 999 then (number attribute) = 999" before you draw it. But I'm kind of guessing at what the problem is. You may want to add more details to your question to help people understand what exactly is going wrong.
