Thanks for the tip. I have played around with your idea this morning and have come up with a few discoveries.
It appears that the trigger to limit conditional highlighting is the 15th entry. In my problem, I deleted number 15 and then did as you suggested and added 15 and 16 back with no entry in the data box. I could then go back like you did and enter the data for the last two rules. When I first tried it, it did not work, so I went back and deleted rules 15 and 16 and repeated the process by adding rules 15 16 and 17. Rule 15 was the original rule 15 which worked fine. Rule 16 was a dummy rule which said bold andy cell with Z in it. I put cell with z in it to test it and it did not work. so I removed my Z and used rule 16 as a dummy. Then I made a rule 17 which was actually the rule I wanted. That worked fine.
I found that if you were adding a lot of rules and you had to leave the spreadsheet, you lose any rules that does not have data in it. A solution to this would be if you were going to have a huge number of rules, make the rules you need leaving the data blank and then go back and set each rule to text is z or any other character you want and do that fall all the rules. Then you can close the spreadsheet and come back later and all the rules that you created with the filler z can be edited to the actual values. If you press done before you have a value in the text box, it will delete that rule.
I am going to try 32 rules and see what happens.
