Selecting which rules to apply from a constructor file.

[siddhanthramani]

Hello, I have a doubt.
Is there any way to choose which rules from a constructor file should be applied on the facts.
For ex., if there are 10 rules in a constructor file and I want to choose only 5 of them to be applied on facts, what should be done?
i.e how do I activate a subset of rules from the entire rules list?
Thank you.