I want a field in Adobe acrobat in which when i click once it show "+", when twice it show "-" and when click thrice blank

It's possible to make it simpler using just buttons for each fake checkbox, but I don't have a demonstration of that. The basics of the coding is in the sample though. To create that many buttons and set them up with a script, I'd use JavaScript to create the buttons and set up the script in the Mouse Up event, like you see in that sample. Have you done much scripting in Acrobat?