If somebody has genital herpes is it possible to have protected sex and not transfer it to someone without it?? or best not to risk it.

Yes: It is always good to have protected sex especially in this situation. When there are no lesions and you are using a condom, you are dramatically reducing the risk of transferring herpes. Good job.

What is "protected"?: If using a condom, notice that the condom is just a plastic wrapper. Herpes can occur on other parts of the body, so whatever is not under the wrapper is still vulnerable to infection. That means it's ok to have sex if one is a herpes carrier, but use as much protection as practical, talk with the primary care doctor about anti-viral pills, and decide with the sex partner what to do, or not to do.