How to set up validation such that Q2 response must be equal or less than Q1 with categoricals?

More detail; say Q1 is "how many employees are at your company?" with responses in buckets as shown below.

1. 1 - 4 employees


2. 5 - 49 employees


3. 50 - 149 employees


4. 150 - 299 employees


5. 300-499 employees


6. 500-999 employees


7. 1,000-4,999 employees


8. 5,000+ employees

Then Q2 is "how many of these use a particular type of software?" with the same buckets as responses. How can I set up logic to ensure that responses to Q2 are equal to or less than the response they provided to Q1?