Rabbits do not get colds in the same sense that people do. The rabbit's condition may be allergies; it may be serious. You need to look at the larger picture, tfb4me. I know you've posted about your rabbits before and I know they are fairly new to you, but can't remember details, so please recap so we can determine your best course of action.
How long have you had your rabbits?
How many do you have?
Did they all come from the same place and have they been in close contact with each other?
If you have only a few and are not planning to expand by bringing in new rabbits from outside and IF the rabbit doesn't seem to be sick and you are not planning to sell to the public, you may choose to ignore the sneezing, concluding that dormant pasteurella may be in your herd. Some authorities believe that as many as 80% of rabbits (I think that was the figure) carry this disease, but it rarely surfaces except in times of stress. I've had my rabbits for six years and have had no problems, but they may well be carriers if the statistics are correct.
Pasteurella poses no threat to people and the meat from the rabbits is unaffected by it.
On the other hand, if you are raising them for sale as meat or pets or have plans to show them, you need to attack this problem more aggressively, get to the bottom of it and likely cull any infected rabbits. For this, a proper diagnosis would need to be made, and that would involve havign cultures taken, vet visits, antibiotics etc... costly and difficult. It would be wrong and unethical to spread pasteurella by selling or giving away rabbits from an infected herd.