Put the models in your ns\models\yourmapname\ directory, then in VHE add a "cycler" entity. Set the model parameter to the path to the model, for example "..\yourmapname\trogdor.mdl". And that's it. If you're using VHE 3.5 (beta) it will display the model in the editor, i'm not sure if 3.4 does.
But please, please PLEASE confine simple questions like this to the
Mapping Help and Troubleshooting forum.