Go offline to one person only in skype?

Solution 1:

Seems like the best way to go is to block the contact.

In this link that points to a thread in Skype Community you can find more information:

http://community.skype.com/t5/Mac/Appear-Offline-to-Some-but-Online-to-Others/td-p/18266

in your case, you can temporarily block the contact/s whom you don't want to see you online. Blocked contacts will not be able to see the status on the contact that blocked them. Then you can just unblock them anytime you wish to. They will receive no notification or whatsoever when you block them, so they will be clueless that you blocked/unblocked them.

If you need to block/unblock multiple contacts, you can also place those contacts under a contact category.